add class key to QgsOracleFeatureIterator

fixes "a class-key must be used when declaring a friend" error on compile
fix warnings
translation update: new language Bosnian
translation update: bosnian string updates
Merge pull request #536 from frugardc/master

Fix for  "a class-key must be used when declaring a friend" on make using Oracle Spatial
Blend modes apply to whole layer, not individual objects (fix #7603)
show loading layer in status bar
A start
Getting somewhere
Some cleanup