Let a script override testEnv in sub_test &c.
Merge branch 'skipifAsScript' of github.com:hildeth/chapel into skipifAsScript
Add tests for result == "True" per Thomas' request.
Now sub_test only looks at the execute permission to determine if a skipif should be run.
Update RecordConstructor2.skipif using python's 'in' operator.
Merge pull request #760 from hildeth/skipifAsScript

Run skipif files as scripts

This patch adds the capability to run .skipif, .skipif and SKIPIF files as scripts, augmenting the current behavior where these are piped through the util/test/testEnv script.
The scripts that use testEnv now check to see if the skipif file is executable. If so, the file is run as a script and its output is used to determine the skipping behavior. If not, then the file is used as input to testEnv, and the output of testEnv is used to determine whether the test is run (just as before).
The output from the script can be either "1" or "True" to skip the associated test or directory.