Select import plug-in dialog should not display auto-detect option in 'File format' list for plug-ins with no configurations

[Nicklas Nordborg]

There are three requirements for this bug to be seen:

1. The plug-in must support autodetection
2. The plug-in must be usable both with and without a configuration
3. There shouldn't be any configurations

If this is the case, selecting the plug-in from the 'Plugin' list the auto-detect option is still visible in the 'File format' list. Since there is no file format for to use for auto-detect this options should be hidden. In practice, the plug-in should be handled in the same way as a plug-in that doesn't support configurations.

Note! The new AnnotationFlatFileImporter is the only core plug-in that fulfill all requirements.

[Nicklas Nordborg]

(In [3589]) Fixes #693: Select import plug-in dialog should not display auto-detect option in 'File format' list for plug-ins with no configurations

[Jari Häkkinen]

(In [4044]) Addresses #693. Removed references to plain matrix in GUI.