configure: fix --enable-check-runtime-deps

Checking runtime deps is the default, but a bug in the configure script
would turn the feature off if --enable-check-runtime-deps was given.

This makes it do the right thing in all five conditions:

(no argument given):             do runtime dependency checks
--enable-check-runtime-deps:     do runtime dependency checks
--enable-check-runtime-deps=yes: do runtime dependency checks
--enable-check-runtime-deps=no:  skip runtime dependency checks
--disable-check-runtime-deps:    skip runtime dependency checks
pncconf -GTK BUILDER refactor
pncconf -fix live test bugs - openloop and stepper tune test

tried on a real machine with the 5i25
pncconf -factor out mesa and parport loading wip

I want common code for load,reading and writing mesa and pport interfaces.
common between config HAL file and HAL tests.
Then if we fix one we fix both.
pncconf -add pport test panel button
pncconf -fix parport test for pport2

and change how pport gets it's data from the screen
pncconf -fix up tests to use common I/O loading code

common between config written HAL file and live test HAL
pncconf -live test WIP
pncconf -change share/ location definition code

let linuxcnc python extention figure it out for us
pncconf -exculsive check fixed

Exclusive test now checks mesa page and pport pages for input signals
that are exckusive.
pncconf -wip

fix 7i43 address being ignored
pncconf -make the 5i25 default and use internal data

now users can configure the 5i25 without adding firmware,
at least for the common firmware
pncconf -fixing tests wip
pncconf
pncconf -ignore generated files
pncconf -PID stepper config wip
pncconf -fix internal firmware, hal PID names, sserial name
pncconf -fix openloop test

couldnt set dac values with servo motor selected
hal -add axistest and simple_tp components

PNCconf will use them for axis testing.

axistest is only slightly different from stepconf's steptest,
steptest required velocity and acceleration settings.
axistest only speaks position targets (even while jogging)

Simple_tp is a comp version of motion's jogging tp
this outputs position and velocity commands so can be used with
PID to test PID steppers and servos
pncconf -use axistest and simple_tp for tuning tests.

this still uses positional stepping - soon to be velocity stepping