Convert auxFS skipifs to python scripts for clarity.
Merge branch 'master' of github.com:chapel-lang/chapel into aux-fs-skip-as-python
Merge branch 'master' of github.com:chapel-lang/chapel into aux-fs-skip-as-python
Convert >= skipif to python script for clarity.
Remove "does not contain" skipif operator.

>= (aka does not contain) operator was added in #591, but now that general
python scripts can be used as skipif files it is no longer needed. >= is not
intuitive, so removing it now (before it is used throughout the test system)
is desirable.
Add >= back in, after review feedback.
Merge branch 'master' of github.com:chapel-lang/chapel into aux-fs-skip-as-python
Merge pull request #779 from thomasvandoren/aux-fs-skip-as-python

Aux fs skipifs as python

Convert skipifs that were using `>=` (aka "does not contain") operator to python
scripts, for clarity.