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
Changed the top sentence in README.typeQueries
to be closer to how other READMEs in this directory start.
Fix for Coverity bug 1212416

Coverity correctly pointed out that returnInfoGetMemberRef had an INT_FATAL call
and a return statement that would never be reached, as the if/else branch above
it had a return statement at the close of both branches.  I have removed these
lines and tested this over std.
Fix Coverity issues 1212401 and 1212402

In stmt.cpp, Coverity noticed that there were null checks for two variables that
had already been checked.  While what it complained about was the possibility
that the later dereference was to a null pointer, it was fair to point out that
the variables did not need to be checked again.  I believe that removing the
additional check will resolve these issues.
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.
Merge pull request #546 from lydia-duncan/coverity1212416

Fix for Coverity bug 1212416 [reviewed by hildeth]

Coverity correctly pointed out that returnInfoGetMemberRef had an INT_FATAL call
and a return statement that would never be reached, as the if/else branch above
it had a return statement at the close of both branches. I have removed these
lines and tested this over std.
Merge pull request #547 from lydia-duncan/coverity1212401

Fix Coverity issues 1212401 and 1212402 [reviewed by hildeth]

In stmt.cpp, Coverity noticed that there were null checks for two variables that
had already been checked. While what it complained about was the possibility
that the later dereference was to a null pointer, it was fair to point out that
the variables did not need to be checked again. I believe that removing the
additional check will resolve these issues.
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.