Merge pull request #80 from mrd/master

Rremoving "two-mode-mode" code because it is buggy, out of date, and not...
added two keywords
Updating: very minorly improving
Updating: preparing for the release of ATS2-0.1.0
Updating: preparing for the release of ATS2-0.1.0
Updating: very minorly improving
Updating: preparing for making libgmp optional
mend

Updating: preparing for making libgmp optional
Updating: minorly fixing
Updating: preparing for the release of ATS2-0.1.0
Updating: very minor fixes
Updating: minorly improving
Updating: improving the build process for ATS2
Updating: improving the build process
Updating: minorly fixing
Updating: minorly fixing
Updating: adding a missing file
Updating: adding list_set_at and list_exch_at
Updating: moving some projects out
Updating: minorly improving share/atsmake-post.mk