Fix for Coverity Issue 1241468.

Coverity is complaining about a negative return from _ltoa_convert defined in
qio_formatted.c.

It is easy enough to rewrite this routine so that it returns a result that can never be
negative.  Hopefully, that will quiet Coverity on this issue.

Redefined the return value from the number of characters to skip *before* encountering the
start of the converted number to the *position* of the first valid character.  Before, the
return value could range from [-1..tmplen-2].  Now its range is [0..tmplen-1].

I changed the client code to accommodate this new definition of the return value
(basically subtracted 1 from it).

I changed the return type to size_t, which is an unsigned type so it can't go below zero.
Update length calculation in _ltoa.
Merge branch 'master' into fixCoverity1241468
Introduce WhileStmt::condExprGet/Set to wrap uses of BlockStmt::blockInfoGet/Set
Update AST_CHILDREN_CALL to separate WhileStmt from BlockStmt
Add #include "WhileStmt.h" where necessary
Rename isWhileLoop etc to be isWhileStmt
Make start_test more multi-locale friendly

For multi-locale testing on crays we always have to throw --nostdinredirect and
--launchertimeout <launcher>. This just makes start_test infer those values for
most situations to make our lives easier when running start_test.

Previously start_test would not be able to run any tests or would never
complete execution if you didn't throw these on a cray and it wasn't obvious
what was going wrong

Throw --nostdinredirect unless there is no launcher or the launcher is
amudprun.  we know that stdin redirection doesn't work for most launchers. only
do redirection when there's no launcher, or the launcher is amudprun, which we
know supports stdin redirection. Warn user about skipping tests unless they
threw -nostdinredirect or -stdinredirect or an env var is set to silence it

If the launcher name contains slurm set CHPL_LAUNCHER_TIMEOUT to slurm, and if
the launcher name contains pbs or qsub set CHPL_LAUNCHER_TIMEOUT to pbs. These
launchers handle timeouts themselves, and we don't need/want sub_test to be
trying to do it's own timeout mechanism.
Let _ltoa_convert() return -1 to indicate buffer overflow, and handle this in the caller.
Update BasicBlock construction to use condExprGet() for WhileStmt
Simple updates
Handle degenerate WhileStmts that are in the process of being removed
Merge branch 'master' into fixCoverity1241468
Update sub_test to pass walltime to slurm and look for timeouts

We let slurm handle timeouts instead of using sub_test's mechanisms. However,
we never actually looked for timeouts or told slurm what timeout to use.
Instead we just let the default timeout be used and didn't record the fact that
a timeout occurred.

This updates sub_test to pass --walltime to the executable which will in turn
set the actual slurm timeout. We also not look for the timeout and create an
appropriate error message like we do for pbs.
Merge pull request #912 from ronawho/multi-locale-test-improvements

Make start_test more multi-locale friendly

[reviewed by @Kyle-B]

For multi-locale testing on crays we always have to throw --nostdinredirect and
--launchertimeout . This just makes start_test infer those values for
most situations to make our lives easier when running start_test.

Previously start_test would not be able to run any tests or would never
complete execution if you didn't throw these on a cray and it wasn't obvious
what was going wrong

Throw --nostdinredirect unless there is no launcher or the launcher is
amudprun. we know that stdin redirection doesn't work for most launchers. only
do redirection when there's no launcher, or the launcher is amudprun, which we
know supports stdin redirection. Warn user about skipping tests unless they
threw -nostdinredirect or -stdinredirect or an env var is set to silence it

If the launcher name contains slurm set CHPL_LAUNCHER_TIMEOUT to slurm, and if
the launcher name contains pbs or qsub set CHPL_LAUNCHER_TIMEOUT to pbs. These
launchers handle timeouts themselves, and we don't need/want sub_test to be
trying to do it's own timeout mechanism.
Merge pull request #914 from noakesmichael/blockInfo-0

Begin to decouple WhileStmt from use of BlockStmt::blockInfoGet/Set

Introduced methods condExprGet() and condExprSet() for WhileStmt.

Begin to identify uses of blockInfoGet/Set that can be replaced with these.


Compiled: STD clang/darwin, STD gcc/linux64, LLVM gcc/linux64
Tested: paratest and paratest --verify --llvm
Review: None
Add a nodelist option to the slurm launcher

Allow a nodelist to be specified for the slurm launcher. This can either be set
by passing the executable a --nodelist or by setting the env var
CHPL_LAUNCHER_NODELIST
Merge pull request #909 from hildeth/fixCoverity1241468

Fix coverity1241468

 Let _ltoa_convert() return -1 to indicate buffer overflow, and handle this in the caller.
Update regressions with results from this weekend and today.
Merge pull request #915 from thomasvandoren/triage

Update regressions with results from this weekend and today.