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Merge changes from trunk r755 to r800 into the 16-bit branch.
Created a new branch for the development of 16-bit support.
Fixed several items that were being incorrectly rejected as "not fixed length" in lookbehinds.
Marks in non-capturing atomic groups were not being passed out.
Make (*THEN) work as in Perl in subpatterns that do not contain | alternatives.
Tests for recent bug fixes.
Test updates.
Allow all characters except closing parens in MARK:NAME etc.
Avoid false positive for infinite recursion by not checking conditionals at compile time, but add tests at runtime that also catch infinite mutual recursion.
Fix three compile-time bugs (Bugzilla #1123).
Permit quantifiers on parenthesized assertions.
Make (*MARK) work in positive assertions.
Remove atomic from single repeats; convert possessive atomic to possessive non-atomic (because they are the same).
Fix capturing not happening in assertion conditions.
Fix two study bugs concerned with minimum subject lengths; add features to pcretest so that all tests can be run with or without study; adjust tests so that this happens.
Fixed newly introduced bug for patterns like /(?:(b))++/, where the capturing was happening, but not setting the correct return code.
Fix bug with /\A.*?(?:a|b(*THEN)c)/ by removing the tail recursion optimization for the final branch. Also fix a similar bug for conditional subpatterns.
Fix problems with capturing parens and *ACCEPT with recursion.
Refactoring to reduce stack usage for possessively quantified subpatterns. Also fixed a number of bugs related to repeated subpatterns. Some further tidies consequent on the removal of OP_OPT are also in this patch.
Remove OP_OPT by handling /i and /m entirely at compile time. Fixes bug with patterns like /(?i:([^b]))(?1)/, where the /i option was mishandled.
Fix internal error for recursive named back references.
Tidy up test comments, now that Perl >= 5.10 is generally around.
Add test for a (*SKIP) bug that was fixed by other changes.
Make (*COMMIT) override (*THEN) and similar.
Fix forward reference in the presence of (?#( (open parens in comment).
Avoid loop caused by (*SKIP) with an argument.
Add support for *MARK and names for *PRUNE, *SKIP, *THEN.
Fix incorrect compile time error for certain types of recursive patterns.
Fix bugs with \K in atomic groups, subroutines, and assertions.
Fix bugs relating to the use of (*SKIP) etc in assertions.
Document more clearly capturing behaviour for recursion and subroutines.
Fix problems with conditional references to duplicate named subpatterns.
Allow duplicate names for same-numbered groups; forbid different names.
Allow fixed-length subroutine calls in lookbehinds.
Add more explanation about recursive subpatterns, and make it possible to process the documenation without building a whole release.
Minor doc fix; update tests by adding comments to each file, and generally tidying.
Re-organize tests to make is possible to test 5.10 features against Perl.
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