Barely working variable implementation
fixed RT #86651, xml_pp, quote not escaped in attribute values
added test files and updated MANIFEST
updated Changes to conform to CPAN::Changes + test
Update Twig.pm

Fix URL. Document can no longer be found directly from Oracle.
Updated tinyURL points to the last version on the archive.org Wayback Machine.

Addresses RT ticket 85400:

https://rt.cpan.org/Public/Bug/Display.html?id=85400
commit before doc update
merge branch 'patch-1' of https://github.com/MartinMcGrath/xmltwig
fixed code that gave a warning in 5.19.9
removed failing tests
added docs for tools and safe_print_to_file
skip a failing test in perl < 5.12
added Changes fro 3.45
use _set_weakrefs instead of $XML::Twig::weakrefs
bug in escaping CDATA sections in HTML (RT #86773), fixed, tested and change recorded