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.
Merge remote-tracking branch 'origin/master' into tag-source-files-with-license-comment
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
Merge branch 'master' into miniMD
Merge branch 'master' into miniMD
Clean up .../test/tmp directory when done with start_test
Adding performance files for reverse-complement
More RBC cleanup.

Remove extra .good and .prediff, and update comment.
Update default RBC test size so correctness testing runs faster.

Perf testing will still use the original problem size from the paper.
Adding performance files for regex-dna
Fixing typo preventing start_test from cleaning test/tmp
Merge branch 'stdin-in-execopts' into fasta-stdin-perf
Revert "Prepend comment to all sources with copyright and license information."

This reverts commit 06183d95b8d07e443c78240675e2fb6bf0ff95d8.

Conflicts:
	make/Makefile.release
Merge branch 'master' of github.com:chapel-lang/chapel into tag-source-files-with-license-comment