More RBC cleanup.

Remove extra .good and .prediff, and update comment.
Update default RBC test size so correctness testing runs faster.

Perf testing will still use the original problem size from the paper.
Merge branch 'stdin-in-execopts' into fasta-stdin-perf
Initial set functionality support for associative arrays and domains
Simple tests for set features
Splitting tests into appropriate directories
op= set support for associative arrays
op= tests for associative arrays and domains
In removeParamArgs(), kip calls that are not in the tree.
types/records/bharshbarger/nestedRecordInClass1.future is retired due to #196.
Changed par_iter_recursive.bad to track resolution change due to #196.

The new error message actually mentions recursive iteration, so can be judged an
improvement on the previous version.
Test classes/bradc/innerGeneric/innerRecord is cured by #196.
Merge branch 'master' of github.com:chapel-lang/chapel into rbc-fixes
Simple subset test
Remove valgrind skipif for RBC test.

Now that the correctness test grid size is smaller, valgrind testing does not timeout.
Simplify 'proc -' for domains as sets
Merge branch 'master' of github.com:chapel-lang/chapel into sets
Provide separate calls for environmental and default call stack sizes.

Replace chpl_task_getMinCallStackSize() with separate calls to get the call
stack size from the environment (chpl_task_getEnvCallStackSize()) and the
default call stack size (chpl_task_getDefaultCallStackSize()).  This change
was mainly needed for qthreads, where we want a call stack size specified
by Chapel's CHPL_RT_CALL_STACK_SIZE environment variable to override any
specified by the Qthreads (QT|QTHREAD)_STACK_SIZE environment variable, but
we want the Qthreads environment variables to override the Chapel default.

I made a few other changes while I was here.  In chpl-tasks.c I did some
code cleanup.  In tasks-massivethreads.c, I clarified a comment and cleaned
up some white space to match their coding style.  And, I deleted these four
.execenv files, which all specified a stack size of 8000000 bytes, as far
as I could tell in order to deal with the tasking layer implementation-
dependent call stack sizes we used to have:
  test/distributions/robust/associative/basic/array_write.execenv
  test/distributions/robust/associative/basic/domain_write.execenv
  test/distributions/robust/associative/basic/whole_domain_assign.execenv
  test/parallel/cobegin/deitz/test_big_recursive_cobegin.execenv
Making domainSetOps.chpl validate itself instead of matching some text output
Removing text output as assertions are sufficient for validation