io: add function isDir

This function will check whether the given path is a directory.
io: add isFile

This function will check whether the given path is a regular file.
Added tests to test/studies/colostate. include our Jacobi-2 and 3-D tests of tiling, naive parallel and serial
Mild change to header
Start on new pidigits version that uses BigInt class.
Properly initialize a couple vars to 1 instead of 0.
Adjust default n value.
Merge branch 'master' of github.com:chapel-lang/chapel into use-bigint-for-pidigits
Fix Coverity issue 1212355

Coverity had informed us that a variable could be null at the point where it
was being dereferenced during code generation.  This inserts a minor check to
make sure that is not the case.  Tested over std.
Fix BUILD_VERSION value in non-repo, non-development environment.

When the tarball is unpacked, value set in BUILD_VERSION should default to "0"
(including quotes). Previously, it was setting the value to literal 0, which
was appropriate in the SVN world.
Add version string check in testRelease
Update default 4th version number to be empty string.

Updates version.cpp to check for empty string.
Fix boolean expectation from strcmp.
Fix for Coverity issue 1212292

Coverity correctly pointed out that the variable debug in checkResolved's
isDefinedAllPaths does not change and so the true branch for if (debug) will
never be executed.  This code appears to be solely for debugging purposes and as
such should only be executed intentional by a developer.  To that end, leave the
code present but in a form where it will not be analysized.
Revert "Fix boolean expectation from strcmp."

This reverts commit c9a687d927e07aad1eab655ee271e00cb93adbd7.
Fix strcmp comparison, finally.
Update testReleaseHelp to detect expected version string from version_num.h
Fix csh subshell argument escaping...

oye. csh.
Fix csh quote escaping.
Merge branch 'master' into coverity1212355