Log Message:
Update to 0.15:

Version 0.15 (2004/02/04)
-------------------------

* Documentation changes to match Buildtool 0.15.

  - Removed all information about bt_make and bt_wrap.

  - Added preliminar information about the new bt_logic module.

* Added a simple tutorial for developers, guiding them in the creation of
  a simple project from the beginning.