[SEC] installer: Log actions at key points during install.

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@50339 b456876b-0849-0410-b77d-98878d47e9d5
[MRG] Automatic merge, branches/12.x 50337 to 50339
Conflicts resolved on tiki-install.php manually

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@50344 b456876b-0849-0410-b77d-98878d47e9d5
[SEC] installer: Remove one log action that can cause errors and minor changes to other log messages to be more useful; convert more $_REQUESTS to $_POSTS by converting more queries to forms

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@50345 b456876b-0849-0410-b77d-98878d47e9d5
[MRG] Automatic merge, branches/12.x 50339 to 50345

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@50346 b456876b-0849-0410-b77d-98878d47e9d5