globalredirect 5.x-1.4

Many bug fixes backported from Drupal 6 - mostly to fix some infinite loop problems.

Also backported the settings module (implemented as a separate module as D5 cannot handle path-specific includes). This allows enabling and disabling of features such as trailing slash removing, removing '/0' from URL's (like taxonomy/term/2/0; its the same as taxonony/term/2) and the "non-clean to clean" redirecting.