New spell check exceptions, and delete tab keys
New spell check exceptions, and delete tab keys

In Prolog files, the spell check is a really frustrating, and as it seems
Matlab/Octave files aren't truly supported, it's seems to be handled like an
ordinary text file, which is annoying as well.

The removal of the tab key mappings is done due to the fact they aren't needed,
since there exists already predefined bindings for this objective, more
specific, gt and gT.

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