[FIX] parser: When resetting the parser option, (if they have been set before) then preserve some settings such as absolute_links so that nested plugins (in newsletters for instance) keep their links absolute (thanks Xavi, addresses wish5162)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@50586 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] avatars: Observe absolute_links in the parser so avatars work in newsletters

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@50587 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] newsletters: Same fix as r48415 but for the subject link as well this time, so you do actually send the revised edition as expected, not the saved one from last time (logic very hard to follow in the code, but thanks Bernard, addresses wish5179 hopefully)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@50588 b456876b-0849-0410-b77d-98878d47e9d5