Add script to verify copyrights in source files.
Run checkCopyrights.bash in smokeTest.
Add script to prepend copyright with license info to source files.

The util/buildRelease/add_license_to_sources.py script accepts a list of files,
detects the type of comment for each one, and then prepends a comment including
the copyright with license info. The content is stored in a separate file to
make versioning/history easier.
Prepend comment to all sources with copyright and license information.

This uses the new `util/buildRelease/add_license_to_sources.py` script. I ran
this code in bash to tag all of these files:

```bash
find "compiler runtime make modules" \
    -name Make\* -o \
    -name \*.c -o \
    -name \*.chpl -o \
    -name \*.cpp -o \
    -name \*.g -o \
    -name \*.h -o \
    -name \*.lex -o \
    -name \*.y -o \
    -name \*.ypp | \
    grep -v compiler/parser/chapel.tab.h | \
    grep -v compiler/parser/chapel.tab.cpp | \
    xargs ./util/buildRelease/add_license_to_sources.py

find . -maxdepth 1 \
    -name Make\* | \
    xargs ./util/buildRelease/add_license_to_sources.py
```

Those find calls were derived from the existing `make/Makefile.release`, which
is called from `util/buildRelease/gen_release`. I did not include the `*.g`
files because none such files exist in the repository.
Remove make/Makefile.release and do not call it from gen_release.

This is no longer needed, since the sources have the comments when they are
checked into the repo.
Builds hello.chpl and blows chunks.
Now runs hello.chpl
This version fixes the problem with varagrs.chpl.
This version passes all primers tests.
Merge remote-tracking branch 'origin/master' into tag-source-files-with-license-comment
Merge branch 'master' into callDefaultConstructors
Fix flattenFunctions.cpp:191 assertion failures by adding .readFE() or .readFF() explicitly in test sources, in lieu of (disabled) statement-level symbol insertion.
Adding first cut of curl support, have to fix a problem in qio_channel_revert_unlocked
Merge branch 'master' into curl
Adding standard performance testing files for k-nucleotide
Adding files to generate and use fasta input files
Clean up /Users/bharshbarg/chapel/edge/test/tmp when done with start_test
Resolves all but 3 of compile-time failures.
Fixing qio_channel_revert_unlocked_error. Funnily enough, the error was being caused by bad error handling in curl_preadv
changing so that clang likes it