[FIX] sefurl: RewriteBase setting in htaccess can have leading spaces

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@47998 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] sefurl: RewriteBase setting in htaccess should be before RewriteRules (and simplify comments)

git-svn-id: file:///var/local/code.tiki.org/tikisvn/branches/12.x@47999 b456876b-0849-0410-b77d-98878d47e9d5