Update parrot from version 2.6.0 to 2.7.0.

Pkgsrc changes:
o Adapt to changes in installed files, and a new perl script.

Upstream changes:

- Core
  + cleanups in packfile and freeze/thaw handling
  + Hash optimizations that improve HLL startup and run time
  + As always, many bug fixes and other optimizations
- Runtime
  + some runtime library cleanups
- Testing
  + added more tests to improve coverage
  + new codingstd test for documentation in .pmc files
- Documentation
  + added documentation to .pmc files (some still missing but headers in place)
  + general documentation improvements and bringing up-to-date
- NQP-rx
  + Updated version included from http://github.com/perl6/nqp-rx includes
    speed improvements

(he)