WebSubmit: more support for FCKeditor attachments

• Parses the input fields for links to files uploaded via FCKeditor, attach these files to the record via FFT, and replaces the links with the newly created local URLs (/recid/files/...).

• New 'attachsubmissionfile' action for allowing upload of files with FCKeditor during submission.

• Moved FCKConfig.EditorAreaCSS and FCKConfig.EnterMode variable to the config file so that they can be customized if needed.

• Use FCKeditor version 2.6.4.

• Uploaded FCKeditor files go to /var/tmp/ instead of /var/data/, so that they can be collected via FFT.

• Get temporary files uploaded by FCKeditor from CFG_SITE_URL/submit/getattachedfile/ instead of CFG_SITE_URL/submit/getfile/

• Added Move_FCKeditor_Files_to_Storage.py function.

• Fixed docstrings.

• Try to create icon only if user is authorized to upload files.