GDTImporter params extension

Adjust GDTImporter so extra values can be passed trough params and
GDTImporter is also checked to work with subjects in the new domain
model.
GDTImporter params extension

Adjust GDTImporter so extra values can be passed trough params and
GDTImporter is also checked to work with subjects in the new domain
model.
Now ignoring Eclipse project files
Update for importing samples and attach them to subjects

Samples are no longer associated with sampling events or eventgroups, as
that complicates the import wizard a lot
Removed checkbox for associating events to subjects

As the new domain model doesn't allow such a relation
Merge remote-tracking branch 'origin/refactoring'