Rework *Path and fullUrl properties

[mosipov]

The current situation:
connector.userFilesPath serves several purposes. It resolves against the current context and the url path.

connector.fullUrl is a boolean switch.

The default behavior of other connectors:
connector.userFilesPath solely reflects a http(s) url with or without a domain name.
connector.userFilesAbsolutePath points to the local file system.
connector.fullUrl is not present.

The Java integration should reflect the default behavior as close as possible.

For more references see:

1. ​http://docs.fckeditor.net/FCKeditor_2.x/Developers_Guide/Configuration/Built_in_File_Browser#Returning_Full_URLs
   
2. ​http://dev.fckeditor.net/browser/FCKeditor/tags/2.6.3/editor/filemanager/connectors/php/config.php#L37