update implementation of profile2_tab
implements bibdk_provider usersettings method
activate first tab as default
sort by weight
Merge branch 'feature/80-export_refworks_endnote' into develop

Conflicts:
	bibdk_usersettings.module
Resolve merge conflict from feature branch 80-export_refworks_endnote
Changed lineendings.
Starting at version 7.x-0.1.
Merge branch 'release/7.x-0.1'