
* APP_URL is found automatically in the 'webapp.php' of the application,
  so there is no need to modify it in 'config/const.Paths.php'.
  This means that from now on we don't need to change the config of
  an application when we change its location or rename its folder.

* UP_PATH and UP_URL have been defined as well, so that instaed of
  APP_PATH."../web_app/" now we can use UP_PATH."web_app/".

* .gif images are replaced by .png images

* Added some comments that help phpDocumentor to divide the classes
  and files into packages and subpackages.

* The folder 'eventhandler/' was removed. The file:

  'eventhandler/on.firstTime.php'   was replaced by 'init.php'
  'eventhandler/on.beforePage.php'  was replaced by 'before_page.php'
  'eventhandler/on.afterPage.php'   was replaced by 'after_page.php'

  The file 'global.php' is added, which is included for each page.

* Fixed webapp_styles.

* Added copying permission statements of GNU GPL.

* Converted CRLF to LF for all the files.
