Bug fixes

Port a few 5.x fixes to 6 still hasn't fixed #277241: Error message accessing /weblinks

Oooooooops, forgot to include the patched taxonomy.module

Removed underlining function from tinytax as it was found to be a performance hit
Added underlining if the leftandright module is installed

#272518: Siblingmenue not shown if no submenues found

Applied fix to bug #1 Missing global $base_url declaration active

Changes since DRUPAL-5--1-0-BETA1:

• Part of #238872.

  Remove buggy define (that wasn't even being used anymore) that was causing slowness.

  Thanks, Bevan.