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Add logic to not show special variables in the editor's auto-completion list if it were defined by the user.

Add a missing "!= NIL" (for stylistic consistency)

Also remove some Windows-specific code in ledit() with code that compiles on all plaforms (by replacing GetEditorWindow() with one that returns a wxWindow, instead of an HWND)

Extend the auto-completion logic to include suggesting completions for variable names.

Update the old SourceForge bug numbers to the new ones (after a SourceForge upgrade each project was given a private numberspace for its bugs).

Minor cleanup to CLocalizedNode:
- Add comments
- Rewrite GetName() in terms of GetNode()
- Change a NULL to NIL, since it referred to a NODE*

Fix a problem with the AutoComplete popup in the commander input control where, if you pressed the up arrow in the AutoComplete popup, the focus would be given to the history box, instead of moving the selection in the AutoComplete popup.

Fix a problem with the auto-completion where if it were started just after the " that beings a word or just after the : that being a variable, the suggestions would be for a procedure.

Fix a problem with the auto completion logic where the case-conversion of the suggestions did not convert any non-ASCII characters (characters with accent marks). This make some of the suggestions look weird in non-English languages, which some characters appearing in the wrong case.

Fix a typo (extra comma) and tweak a sentence.