Leverage reloading detection on the IProject class

Informs the IProject instance through the recently introduced setReloadJob,
that the project is being reloaded by a given job. This makes it possible
for the ProjectController to tell whether it's safe to spawn a new project
reload.

BUG: 332934
BUG: 328699
FIXED-IN: 4.7
SVN_SILENT made messages (.desktop file)
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