Untested! Soft limits, max travel, homing changes, new settings.

- WARNING: Completely untested. Will later when there is time. Settings
WILL be overwritten, as there are new settings.

- Soft limits installed. Homing must be enabled for soft limits to work
correctly. Errors out much like a hard limit, locking out everything
and bringing up the alarm mode. Only difference is it forces a feed
hold before doing so. Position is not lost.

- IMPORTANT: Homing had to be updated so that soft limits work better
with less CPU overhead. When homing completes, all axes are assumed to
exist in negative space. If your limit switch is other side, the homing
cycle with set this axis location to the max travel value, rather than
zero.

- Update mc_line() to accept an array, rather than individual variables.

- Added an mc_auto_cycle_start() function handle this feature.
Organization only.

-

planner.c

@@ -3,7 +3,7 @@
   Part of Grbl
 
   Copyright (c) 2009-2011 Simen Svale Skogsrud
-  Copyright (c) 2011-2012 Sungeun K. Jeon
+  Copyright (c) 2011-2013 Sungeun K. Jeon
   Copyright (c) 2011 Jens Geisler  
   
   Grbl is free software: you can redistribute it and/or modify
@@ -360,11 +360,7 @@ inline block_t *plan_get_current_block()
 // Returns the availability status of the block ring buffer. True, if full.
 uint8_t plan_check_full_buffer()
 {
-  if (block_buffer_tail == next_buffer_head) { 
-    // TODO: Move this back into motion control. Shouldn't be here, but it's efficient.
-    if (sys.auto_start) { st_cycle_start(); } // Auto-cycle start when buffer is full.
-    return(true); 
-  }
+  if (block_buffer_tail == next_buffer_head) { return(true); }
   return(false);
 }