Flint: Fix workspace loading
This MR simplify the way to set bliss session in order to fix workspace loading.
- The bliss session is now set to Flint by command line argument
- As result
- There is no need update the display twice at startup
- This allow to distinguish many Flint when using
ps aux
- This fixes an issue relative to workspace loading (which was filtered cause the session was not yet set)
This have to be backported to 1.7