STEPGEN_MAXVEL patch

Signed-off-by: Russell Brown <russell@lls.lls.com>
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.