Refactor readfh, seek, tell to use nqp ops on parrot. Remove backend specifics.
don't trip over custom range operators
this prevented an optimization later on.

may want to revisit this at some point.
optimize all kinds of ranges for for loops.
Fix { for 1..2 {} }() regression

Untested patch supplied by jnthn++
Add more advent tests
We need $*CWD when we need %*ENV
Get proper $*DISTRO info for Mac OS X
We need %*ENV and $*CWD to do qx//
Add darwin specific version / release to $*KERNEL
Mention $*DISTRO/KERNEL changes
Add --ll-exception to setting making

This is mostly useful for those cases where an error in the setting only shows
when making the RESTRICTED setting.  The stack trace then is *really* useful.
Merge branch 'nom' of github.com:rakudo/rakudo into eleven