gladevcp -fix tooledit widget offest editing error with lathes

Would try to set offset of wrong and unavailable axis because it
didn't check the INI for what axis were available.
gladevcp -calculator add some options

num_pad_only makes calulator into a numerical input only.
added global references foe the entry and calc_box, so users can
connect signals or add widgets
gscreen -keep track of the last Gcode line, add a restart dialog

build a restart dialog rather then use the one from GLADE file.
added numerical input buttons to it.

we can keep track of the last gcode line to help on restarts
gscreen configs -add homing indicators and fix the DRO width

removed the restart dialog and entry dialog
Homing indictor only shows when all the axis are homed.
hopefully the DRO won't jump around with fixed widths
added DTG too
gscreen -serach INI INCREMENTS for continuous jogging

If 'continous' is missing add it.
allows one to put the continuous command any where in increments list.
now also explicedly sets increments to continuous
gscreen -sensitize restart button
gscreen -fix error if INI has no INCREMENTS section

gives an alarm message and sets increments to continuous
gscreen -remove entry box from GLADE files

we now use a dialog for entry