Update get_attribute_ref prototype to return bit width of attribute.
Pass bits pointer to get_attribute_ref in nqp.ops.
Update (functional) implementors of get_attribute_ref to return bit-width.

Right now they are hard-coded to just return 8*sizeof(void *). I think that
should be a good way to return the number of bits in a machine word, but
probably a decision that deserves some more scrutiny.
Return correct number of bits in get_attribute_ref in CStruct.c.
Turns out Parrot #defines ALIGNOF, so no need to redo it in CStruct.c.
Handle bit widths in nqp.ops.
Add align field to storage_spec.

Also, adds initialisation of align field to all REPRs (and initialises a
couple of bits fields that weren't).
Merge pull request #69 from hoelzro/master

Add --dynext-path option
Complain when non-assocs get associated.
Change Configure.pl --help to mention [=branch] option of --gen-parrot.
call srand in nqp_bigint_setup

nqp::rand_I uses mp_rand, which in turn uses the system rand() call
add MANIFEST.generated to .gitignore

This is generated by parrot > 4.11
[GH #71] Add -L. -X. to parrot for newer parrots.

See https://github.com/parrot/parrot/issues/368
Merge branch 'dot-libpath-gh71'
Add nqp:: mappings for some 6model operations.
Update bootstrap to get new nqp:: ops.
Some more pir:: => nqp:: in the MOP.
Add nqp::attrinited.

Originally in Perl 6 ops, but is a general 6model thing.
Update bootstrap to get nqp::attrinited.
Fix a couple of op sigs.