motion -add spindle veloity pins with absolute output

Many config need velocity with absolute values, such
as for 0-10 volt spidle drives. These pins make it so
the user doesn't need to fool around with the abs component.
Since we already have the spindle fwd and rev pins this compliments them

Signed-off-by: Chris Morley <chrisinnanaimo@hotmail.com>
trajectory planner -Don't use feed override in rapids

Rapids should not follow feed override settings.
It will still follow max velocity override.
This allows feed and rapids overrides to be set mostly independantly.
If you set max velocity override low enough it will affect feed rate.
pncconf -add missing INI substitution in HAL file

STEPGEN_MAXVEL and STEPGEN_MAXACCEL were added as INI substituitons
in a previous commit - oops missed some entries.
pncconf -fix blank abs and lowpass HAL commands

selecting a gladVCP panel without a spindle speed display
would end up getting a error becauase of trying to load
components without names.
pncconf -use motions need absolute spindle veelocity pins

add the pins to the standard spindle signals.
use them instead of using an absolute component.
pncconf -use an absolute spindle cmd pin if minlimit is 0

This is so the voltage will be 0 to 10 rather then -10 to 10
This covers sserial cards.
Cards that use the main board pwm gen still need this fixed.
they will remain as -10 to 10 - because there is no min limit
setting. I need to add a checkbox to the GLADE file...