A few minor improvements to the nightly script
A few minor improvements to the nightly script

1) Made it so that the nightly results are sent to chapel_cronmail
   (rather than chapel_cronmail_all) if there are passing futures.
   This is designed to help us as a group retire futures and keep
   the number of false positives minimal.

2) Set an environment variable (CHPL_TEST_NO_LOCAL) if we're testing
   --no-local in the nightly cron script so that this condition can
   be considered in a .skipif file.  This is a little weak because
   we should really be setting this environment variable in start_test,
   but it would require us to check the --compopts flags to see if any
   of them are --no-local and I didn't have time to go that far in this
   commit.



git-svn-id: 88467cb1fb04b8a755be7e1ee1026be4190196ef@18890 3a8e244f-b0f2-452b-bcba-4c88e055c3ca

chizarlicious/chapel,hildeth/chapel,CoryMcCartan/chapel,sungeunchoi/chapel,sungeunchoi/chapel,chizarlicious/chapel,CoryMcCartan/chapel,hildeth/chapel,hildeth/chapel,sungeunchoi/chapel,hildeth/chapel,hildeth/chapel,sungeunchoi/chapel,hildeth/chapel,sungeunchoi/chapel,chizarlicious/chapel,chizarlicious/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,sungeunchoi/chapel,hildeth/chapel,CoryMcCartan/chapel,CoryMcCartan/chapel,sungeunchoi/chapel,sungeunchoi/chapel,chizarlicious/chapel,CoryMcCartan/chapel,chizarlicious/chapel,chizarlicious/chapel