[plotterparameter] add plotterparameter type

Adds schema file, beat.core integration, test files & tests

Closes #66

beat/core/prototypes/plotterparameter.json

+{
+        "plotter": "plot/unknown/1",
+        "description": "",
+        "data": {}
+}

beat/core/schema/plotterparameter/1.json

+{
+        "$schema": "http://json-schema.org/draft-04/schema#",
+        "title": "Plotter configurator descriptor",
+        "description": "This schema defines the properties of a plotter configuration file",
+
+        "type": "object",
+
+        "properties": {
+                "description": { "$ref": "../common/1.json#/definitions/description" },
+                "plotter": {"$ref": "../common/1.json#/definitions/reference"},
+                "data": {"$ref": "../experiment/common.json#/definitions/parameter_set"},
+                "schema_version": { "$ref": "../common/1.json#/definitions/version" }
+        },
+        "required": [
+                "plotter",
+                "data"
+        ],
+        "additionalProperties": false
+}

beat/core/test/prefix/plotterparameters/plot/config/1.json

+{
+        "plotter": "user/scatter/1",
+        "description": "A plotterparameter for the built-in scatter plotter",
+        "data":
+        {
+                "grid": true,
+                "legend": "test data",
+                "mimetype": "image/jpeg",
+                "yaxis_multiplier": 2.5
+        }
+}

beat/core/test/prefix/plotterparameters/plot/invalid/1.json

+{
+        "plotter": "user/scatter/1",
+        "description": "An invalid plotterparameter for the scatter plotter",
+        "data":
+        {
+                "not_an_option": 2.5
+        }
+}

beat/core/test/prefix/plotterparameters/plot/invalid/2.json

+{
+        "plotter": "user/not_a_plotter/1",
+        "description": "A plotterparameter for a non-existant plotter",
+        "data":
+        {
+        }
+}

beat/core/test/test_plotterparameter.py

+#!/usr/bin/env python
+# vim: set fileencoding=utf-8 :
+
+###################################################################################
+#                                                                                 #
+# Copyright (c) 2019 Idiap Research Institute, http://www.idiap.ch/               #
+# Contact: beat.support@idiap.ch                                                  #
+#                                                                                 #
+# Redistribution and use in source and binary forms, with or without              #
+# modification, are permitted provided that the following conditions are met:     #
+#                                                                                 #
+# 1. Redistributions of source code must retain the above copyright notice, this  #
+# list of conditions and the following disclaimer.                                #
+#                                                                                 #
+# 2. Redistributions in binary form must reproduce the above copyright notice,    #
+# this list of conditions and the following disclaimer in the documentation       #
+# and/or other materials provided with the distribution.                          #
+#                                                                                 #
+# 3. Neither the name of the copyright holder nor the names of its contributors   #
+# may be used to endorse or promote products derived from this software without   #
+# specific prior written permission.                                              #
+#                                                                                 #
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND #
+# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED   #
+# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE          #
+# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE    #
+# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL      #
+# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR      #
+# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER      #
+# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,   #
+# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE   #
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.            #
+#                                                                                 #
+###################################################################################
+
+import nose.tools
+
+from . import prefix
+from ..plotterparameter import Plotterparameter
+
+def test_default():
+    # test for the "dummy" plotterparameter
+    p = Plotterparameter(prefix, data=None)
+    nose.tools.assert_false(p.valid)
+
+def test_plot_config_1():
+    # test for a simple plotterparameter for a simple plotter
+    p = Plotterparameter(prefix, "plot/config/1")
+    nose.tools.assert_true(p.valid, "\n  * %s" % "\n  * ".join(p.errors))
+
+def test_plot_invalid_1():
+    # test for invalid parameter name
+    p = Plotterparameter(prefix, "plot/invalid/1")
+    nose.tools.assert_false(p.valid)
+    nose.tools.assert_true(p.errors[0] == "'not_an_option' isn't a parameter for plotter user/scatter/1")
+
+def test_plot_invalid_2():
+    # test for invalid "plotter" field
+    p = Plotterparameter(prefix, "plot/invalid/2")
+    nose.tools.assert_false(p.valid)
+    nose.tools.assert_true(p.errors[0] == "Plotter declaration file not found: user/not_a_plotter/1")