Merge pull request #122 from timo/io_pm_nqp_ops

use the several new IO nqp:: ops in IO.pm
add exception for token blorst

This will make "PRE ;" not die with a dubious error message.
Bump NQP_REVISION for fixes to nqp::copy and some CCLASS constants
add symlink and link
run new test file copy.t
let require take paths too

If require`s argument contains a slash or dot treat it like a path
to a file. This means that the file is searched relative to cwd,
variables like CUSTOM_LIBS and INC are not used.
RT #117583: guard against NULL container spec