prevent FOLLOWING ERRORS on linuxcnc

[zarfld]

ensure that convedrsion from Linuxcnc velocity and acceleration units is correct:

sPoKeysPEv2 contains:
float MaxSpeed[8]; // Maximum axis speed (in pulses per ms)
float MaxAcceleration[8]; // Maximum axis acceleration (in pulses/ms/ms)
float MaxDecceleration[8]; // Maximum axis deceleration (in pulses/ms/ms)

LinuxCNC provides in INI configurtation in mm/s or inch/s depending on configuration
MAX_VELOCITY = 8.0
MAX_ACCELERATION = 8.5