GUI improvements

Improves #224 Closes #223 (closed) (shown in status bar that there is no SFG and no crash) Closes #220 (closed)

Add "Select all" and "Unselect all" menu entries. (Helps with #225)

Show keyboard shortcuts in menus.

Add more status bar messages to Scheduler GUI.

added Bug Enhancement SFG GUI Scheduling GUI labels

added 1 commit

• c8cb00eb - Improving SFG GUI

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