Extended test description file format (see fiji_test.cfg)

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

todo: check if generated VHDL compiles and contains all necessary constants and assignments
todo: documentation
todo: beautify default assignments ($FIJI_DEFAULTS)

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

cleanup

According to TR:
1. Transmit FIU configs starting with last FIU
2. In a config, transmit pattern 1 in the lower-order bits
3. In a pattern, transmit bits 2 - 0 in high-low order.

HW did not adhere to 1.,
SW did not adhere to 3.

 - two configuration values per FIU
 - t1 nd t2 instead of arm + inject durations (and without enables)
 - external/!internal trigger selection
 - ID at the end
 - no more connection reset because it is futile without padding bytes

 - 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.

- CONF_ERR type removed
- fault encoding via 2 bits

- minor bug slipped in when introducing the cloning the existing settings
- add support for the 'depends_on' property of FIJI constants

This allows to present the user with a meaningful message in the main window.

 - get rid of separate ARM and INJECT DURATION widths
 - allow for different external and internal representation of values
 - highlight invalid user entries
 - validation of settings depends on tool flow phase (e.g. setup)

LFSR button was permanently disabled until RUNTIME or STUCK_OPEN after PASS_THRU selected in model_menu
Is now also enabled for other fault models

Fixes saving of design constants again.

 - Always save it.
 - Having no FIUs in a config file is no longer an error
 -