Change/Fix: Require peg 1.0, fix variable binding depth errors

Had to (and needed to, anyway) use peg-1.0.  And while this does less
macro magic, and less magic with cl-eval-when, I couldn't get around
using eval.  I wish peg had a function that takes a list of rules and
returns a predicate that matches a string or at point.  (I tried to
work around the lack of that by using parts of peg macros, but it's
very complicated, and everything I tried had one problem or another.)

org-ql.info

@@ -972,6 +972,7 @@ File: README.info,  Node: 06-pre,  Next: 05,  Up: Changelog
      (org-ql-defpred) that consolidates functionality related to each
      predicate.  This will also allow users to more easily define custom
      predicates.
+   • Version 1.0 of library ‘peg’ is now required.
 
 
 File: README.info,  Node: 05,  Next: 049,  Prev: 06-pre,  Up: Changelog
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