Added logging to Tk::Text widget

Added Button to validate/select Net Drivers for FIUs
Added MenuBar, TODO: decide if we use this

Added GUI features for fiji_setup: Choose port names, choose drivers upon save, validate drivers.
Added driver type and path to INI files.

Added port to Makefile so we don't have to edit test config files

Simplified assignment import into Quartus in Demo

TODO: Check if this broke something (looks OK though)

GUI changed to Tabbed layout, Enable checkboxes, Drop-Down for bit values

Modified Netlist.pm so that it prints possible drivers for all selected nets
while importing a netlist.

 - get rid of backend store in FIJISettingsViewer
 - simplify overall function design and data structures
 - re-validate GUI elements on new data (settings or net lists)
 - warn before overwriting existing file in all cases
 - fix preliminary autocomplete (some remaining pre-existintg bugs in CompleteEntry.p)

Because it produces warnings on some versions of Perl.