Castor 1.0.3 release

The version 1.0.3 will be the first public version. Last changes :
- wm_rs module support PDF export
- add imagedb, a picture manager : support resize and crop, and drag&drop in HTML editor
- nice installer which do everything to install a new & clean Castor (untar, check file rights and Image Magick, create data base, create .htpasswd and .htaccess, ...)
- new module (wm_error_document) which catch Apache errors 401 and 404