Merge remote-tracking branch 'origin/feature/6897_qtassistant_images'
Merge remote branch 'origin/feature/6973_fix_rpm'
Merge remote-tracking branch 'origin/feature/6961_wide_angle'
Update nexus dependencies for Ubuntu.

Move version to 4.3 and updates NeXus python package name
following the change in 4.3. Refs #6979
Merge branch 'feature/6979_deb_nxs_dependencies' into develop