make two copies of training data to make the code simpler.
Add options for overridng read and write methods in callables.
remove confusing returns. make parallel ones generators

Remove try and catches
Accept kwargs in init signature of processors

Resolve "The new way of using a single configuration file is not tested yet"

Closes #94

See merge request !100

Resolve "The flag 'execute_only' cannot be placed in a config file"

Closes #92

See merge request !99

Resolve "doc/experiments.rst points to deprecated docs location"

Closes #91

See merge request !98

Resolve "matplotlib Invalid DISPLAY variable"

Closes #89

See merge request !97

Resolve "matplotlib Invalid DISPLAY variable"

Closes #89

See merge request !96

Use switch_backend instead, see https://github.com/matplotlib/matplotlib/issues/3466/#issuecomment-270603717

Merge branch '88-there-is-absolutely-no-need-for-having-a-client-class-in-the-filelistdatabase-implementation' into 'master'

Resolve "There is absolutely no need for having a "Client" class in the FileListDatabase implementation"

Closes #88

See merge request !95

Resolve "No way of plotting open-set DIR curves"

Closes #87

See merge request !94

This reverts commit 29448290.

Small corrections to the documentation and command line help

See merge request !93

Merge branch '78-the-documentation-does-not-mention-usage-of-single-configuration-files' into 'master'

Resolve "The documentation does not mention usage of single configuration files"

Closes #78

See merge request !92

Documented configuration file as the default way of running experiments; other small documentation changes and corrections

Merge branch '86-in-evaluate-py-there-is-no-way-of-using-both-4-and-5-column-score-files' into 'master'

Resolve "In evaluate.py, there is no way of using both 4- and 5-column score files"

Closes #86

See merge request !90

Small restructuring and less repetitions

See merge request !91