Support for the Nist-SRE dataset

Added the NIST-SRE04to16 dataset to known databases.

Added support for .sph files.

bob/bio/spear/config/database/nist_sre04to16.py

+#!/usr/bin/env python
+# @author: Yannick Dayer <yannick.dayer@idiap.ch>
+# @date: Tue 12 Apr 2022 09:36:40 UTC+02
+
+"""Default configuration file for the NIST-SRE database.
+
+Use this file (defined as ``nist-sre`` in ``entry-points``) as parameter to the
+``bob bio pipeline`` commands::
+
+    $ bob bio pipeline simple -d nist-sre [...]
+
+Each of those three protocols have the same dev and eval groups. The differences are in
+**the training set**:
+    - core: Selected set of files from the NIST-SRE database with labels.
+    - core-aug: Augmented data with reverberation or background noise (music, noise,
+        speech/babble).
+    - unlabeled: Different data that were not labeled.
+
+To get the augmented data, please use the correct pipeline configuration. # TODO specify which one
+"""
+
+from bob.bio.spear.database import SpearBioDatabase
+
+if "protocol" not in locals():
+    protocol = "core"
+
+database = SpearBioDatabase(
+    "nist_sre04to16",
+    protocol=protocol,
+    data_ext=".sph",
+    force_sample_rate=16000,
+)