FMSLogo Code

Merge in changes from trunk

Fix the Ctrl+Shift+] and Ctrl+] keyboard shortcuts on GTK+

Fix a build break when not using precompiled headers.

Add SetAccelerators() to offer a table-driven API for setting keyboard shortcuts.
This makes the code smaller and easier to read.

Make NumPad Delete act like Delete in commander history.
This is part of Feature Request #121.

Add a comment about matching legacy MSWLogo behavior

Change Shift+Down at bottom of commander history to not jump to commander input box.
This is part of Feature Request #121.

Fix the Italian translations for X-Low and X-High in the "Select Active Area" dialog box
This is Bug #532.

Prepare FMSLogo to be translated to Solvene.
This is for Feature Request #120.

Improve the error reporting when files don't exist.