Remove special case in cwd for parrot backend.
Remove special case in IO::Handle.write for parrot backend.
Bump NQP revision to get latest IO nqp ops on parrot.
Merge pull request #272 from donaldh/parrot_io

Remove some more parrot specifics in IO.pm
$*VM.(name|version|auth) contain meaningful info

on all current backends
Ooops, fix copy-n-pasto
Introduce RAKUDO_NO_DEPRECATIONS environment var

Mainly intended to be used when running smoke tests
What supported backends do we have utility method
Prevent .pairs affecting (Set|Bag|Mix)(|Hash)

Unfortunately, you can still silently .value++ and .pairs.push.  But at least
they won't affect functioning or the mutability anymore.
$*PERL.backends better written as $*PERL.VMnames
Merge branch 'nom' of github.com:rakudo/rakudo into eleven