General code cleanup and minor change to header box
Add ability to specify regex to supress printing elements.

Users can now specify __no_print_regex in the config file followed by a list of
regular expressions. Any elements that have field names that match any of the
regular expression will not be printed on the forms. Elements nested under the
field_name not printed is also not printe.
Clean code in print_form.py
Clean base_form.py
Clean redcao_form.py