Updates to nightly script to make nightly testing a little more flexible
Updates to nightly script to make nightly testing a little more flexible

[reviewed by bradc]

- Added a -no-futures flag that will *not* run all the futures

- Have valgrind testing explicitly set -no-futures instead of having
  nightly do it

- move compopts and execopts to add their flags *last* so that they
  will override any other compopts or execopts added by nightly (e.g.,
  --baseline)



git-svn-id: 88467cb1fb04b8a755be7e1ee1026be4190196ef@20825 3a8e244f-b0f2-452b-bcba-4c88e055c3ca

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