6.x

- #Support for a 'file' parameter in hook_js() to load another file to find the callback (like hook_menu())
- Basic unit tests.

Backports of 7.x improvements for the 6.x version.

Fixed export bug.
Fixed validation bug.

minor changes since 6.x-1.8 for compatibility with php 5.4

Initialization of the Drupal 6 release. Please test and mark RTBC!