[S15] Make uniprop/uniprops be more useful.

Instead of a hash of ALL THE PROPERTIES, it's a much more useful
single-property lookup.
[S15] Refine meaning of uniprop, add unimatch, unival, unibool

An S15 updated informed by an implementation? Madness!
[S05] Expand information on <|rule> syntax.

Wouldn't want someone thinking that was an exhaustive list, now would
we? :)
just a tiny whitespace fix.
[S05] Reintroduce the .ast method.

Every good language has a few synonyms anyway :) .
Proposed name change for S11
Remove pod tags as a source of meta-information

Meta-information of a compilation unit will need to be specified in the
(currently being specced) META.info file of a distribution.
First stab at speccing distributions and META.info

As part of the ongoing work at the QA Hackathon
Oops, "author" is not part of META.info
Add dependency info on the interpreter
Remove some more pod-based authoritative info
Spec %?META and %?RESOURCE minimally
"excludes" key formatting consistent with others
Rename META.info -> META6.json

Andreas Koenig pointed out that .info is being used for quite some other things
on the Open Source world.  So we (FROGGS + lizmat) decided to change the name
in such a way, that it is more in line with the world and still an easy way to
distinguish a Perl 6 distribution from other distributions.
Merge branch 'master' of https://github.com/perl6/specs
Use "perl" to indicate necessary Perl version
Add lemma's for PAUSE and CPAN
Make CPAN/Github more generic "autorities"
Spec "production" flag in META6.json
Introduction of "supersedes" and "superseded_by"

And some other minor clarifications.