gmoccapy_1_4_0 - turtle jog and analog in for slider values

ver. 1.4.0
- introduced turtle jog, allowing two scales for the
  jog vel adjustment
- new hal pin "gmoccapy.turtle-jog" to switch from rabbit-jog
  (fast mode) to turtle-jog (slow mode) using a hardware switch
- new hal pin for analog input
  * gmoccapy.analog-enable (must be True to activate the analog inputs)
  * gmoccapy.spindle-override-value
  * gmoccapy.max-vel-value
  * gmoccapy.jog-speed-value
  * gmoccapy.feed-override-value
  all four taking a float input as percentage,
  meaning a value from 0.0 to 1.0, setting the corresponding slider
  directly to the given value
- some code rework, mainly in the _init_hal_pin section and on
  encoder counts handling

Signed-off-by: Norbert Schechner <nieson@web.de>
Merge branch '2.6' into 2.7
Merge branch '2.7'