[TxMt] new command: Universal Un/Comment (BBEdit-ish)

[Sune Foldager]

Long commands like this is what makes life easier with modes like e.g. 
emacs, where it would just be one command for each mode bound to the 
same place. The same can be done for compile/make/latex/whatever which 
is, in emacs, often bound to C-c C-c or similar :-).

-- 
Sune.
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