Create virtual drawers.

Virtual drawers are new drawers which contains only (soft) links to the original
files. Organize your drawers and keep the original ones intact. Automatic
virtual drawer updating is not included but one can update them all pushing one
single button.

- 1.2 (5th May 2008):
 - File searching routine changed (deprecated Examine and ExNext function calls
replaced with ExAll)
 - Automatic updating added
 - One new tooltype