MBTiles background refactoring and testing
mbtileslayer opacity setting added
layer action selection corrected, german pref strings added
Aligned all Versions
Merge branch 'RoProducts-mbtilestest' into mbtilesrefactoring
Check for Mbtiles after download startup package
Merge pull request #29 from geosolutions-it/mbtilesrefactoring

Support for MBtiles as Background