Remove unused CHPL_RT_MD types:

- CHAPEL_CODE
- GC_HEAP
- GC_SPACE_POINTER
- FLAG_SERIAL
Added a bug future on a missing const check
Merge pull request #117 from chapel-lang/addRecordArgConstCheckingFuture

Added a bug future on a missing constness check.

From .future: an assignment to a field of a record-typed formal passed by blank intent is not flagged as an error.

Constness checking implemented in SVN r22963 needs to be extended to
report an error in this code. That's because since a record passed
by blank intent is considered "const", it should not be assignable.

proc myProc(y: MyRecord) {
  y.myField = 7;   <--- should be an error                                                                                       
  writeln(y);
}

Thanks to Tim Z for bringing this to my attention.
Runtime string support clean up and refactoring.

This commit moves the launcher-shared C string functions into
chpl-string-support.[ch] and changes the Makefile and other files
appropriately.  I took the opportunity to pare down the #included
files in chpl-string.c and chpl-string-support.c to only what is
needed.

In addition, some remaining invalid uses of chpl_string are removed.
Merge pull request #116 from sungeunchoi/test

Remove unused memory descriptor types

[reviewed by Tom]

This commit removes the following unused memory descriptor types:

- CHAPEL_CODE
- GC_HEAP
- GC_SPACE_POINTER
- FLAG_SERIAL

There are a few remaining unused types, but they seemed like they may be useful in the future (or were possibly not used on accident) as they are related to other descriptors that are used, so I left them in there.
Merge branch 'master' of github.com:chapel-lang/chapel into test
Further re-shuffling.
Look instead for the first '<', as some test scripts add arguments after execopts
Merge pull request #119 from benharsh/stdin-in-execopts

Fix stdin execopts to look for first instance of '<'

Some of our automated tests add arguments after those in execopts, and we were only looking at the last two arguments. This fix will look for the first instance of '<', instead of looking at the second-to-last argument.
Add comments at the top of chpl-string-support.[ch] about the file and
possibly renaming of the file as well as the functions within.
Merge branch 'master' of github.com:chapel-lang/chapel into test
Merge pull request #118 from sungeunchoi/test

Runtime string support clean up and refactoring

[reviewed by David]

This commit moves the launcher-shared C string functions into chpl-string-support.[ch] and changes the Makefile and other files appropriately. I took the opportunity to pare down the #included files in chpl-string.c and chpl-string-support.c to only what is needed. In addition, some remaining invalid uses of chpl_string are removed.

We should consider renaming chpl-string-support.[ch] and the functions within at some point when the string stuff has settled down.
Merge branch 'master' of github.com:chapel-lang/chapel into knuc
Better IO for chaining, cleaning up old files
Merge branch 'knuc' of github.com:benharsh/chapel into knuc