Image inspector has some issues:

*) When autoscale is turned on, size and scale values are not updated neither are disabled
*) Lock aspect ratio does not work
*) mm/sp size check box does not update size values not size units of measure

Fixed by:

1) Sync-ing the enum at the beginning of 	inspectorimage.cpp with iList items
2) Adding a few extra calls to InspectorBase::valueChanged() for commands which change two values at the same time
Merge pull request #433 from mgavioli/Fix_inspector_for_images

Fix inspector for images