[processing] remove selection before running Select by location algorithm (fix #10873)
add relation reference widget to SIP
[Releation reference widget] more coherent method names
[Releation reference widget] use separate button for remove action
rename relreference...to relationreference
[TRANSUP] transifex string update

Signed-off-by: Werner Macho <werner.macho@gmail.com>
Add an isDirty method to QgsColorSchemeList
Remove colors from scheme list on delete/backspace press
Add a colorSelected signal to QgsColorSchemeList
Use copy mode for drag and drop of colors from QgsColorSchemeList,
prevent addition of duplicate colors
Doxymentation for QgsEditorWidgetV2
More Doxymentation
Even more Doxymentation
Doxymentation for relation manager
Use unique value widget doxymentation to appropriate place
Fix doxygen warning
[Relation Reference Widget] allow removing open form button (option not available in QGIS)
add RelationReferenceWidgetWrapper to SIP + complete RelationReferenceWidget
Return to previous state of vector joins if the vector props dialog was cancelled
Followup #10912 - detect cycles in joins and reject joins that would create cycle

Cycle would otherwise cause infinite loop when updating fields and it does not make sense