v1.1c: New sleep mode. Laser mode and other bug fixes.

- New $SLP sleep mode that will disable spindle, coolant, and stepper
enable pins. Allows users to disable their steppers without having to
alter their settings. A reset is required to exit and re-initializes in
alarm state.

- Laser mode wasn’t updating the spindle PWM correctly (effected
spindle speed overrides) and not checking for modal states either.
Fixed both issues.

- While in laser mode, parking motions are ignored, since the power off
delay with the retract motion would burn the material. It will just
turn off and not move. A restore immediately powers up and resumes. No
delays.

- Changing rpm max and min settings did not update the spindle PWM
calculations. Now fixed.

- Increased default planner buffer from 16 to 17 block. It seems to be
stable, but need to monitor this carefully.

- Removed software debounce routine for limit pins. Obsolete.

- Fixed a couple parking motion bugs. One related to restoring
incorrectly and the other the parking rate wasn’t compatible with the
planner structs.

- Fixed a bug caused by refactoring the critical alarms in a recent
push. Soft limits weren’t invoking a critical alarm.

- Updated the documentation with the new sleep feature and added some
more details to the change summary.

doc/log/commit_log_v1.1.txt

@@ -1,3 +1,21 @@
+----------------
+Date: 2016-09-28
+Author: Sonny Jeon
+Subject: New jog cancel real-time command. Parser typo fix from last push.
+
+- Added a new jog cancel real-time command. Rather than depending on a
+feed hold to cancel a jogging motion, this realtime command can be used
+instead. The main advantage is if a feed hold is used, you can
+accidentally hold the machine right when Grbl returns to IDLE after
+completing a jog. And the GUI doesn’t have to worry about tracking this
+either.
+
+- Fixed a typo in the g-code parser edits from the last push. Was
+causing the G10 set coordinate system command to not work correctly.
+
+- Updated the documentation with the jog cancel command.
+
+
 ----------------
 Date: 2016-09-27
 Author: Sonny Jeon