Repository navigation

Test

Merge wip/help-menus: all Help menus open the in-app help viewer at t… #391

Job	Run time
Parsers and dialogs (no build, no display)	2m 3s
GUI apps (build, install, Xvfb)	7m 40s
End-to-end (real code, real monitor, real parsers)	44s
	10m 27s