Fixed a g-code parser issue caused by last commit.

- G-code parser refactoring in the last commit wasn’t tested. Found and
fixed issues with G28.1/30.1 and G38.x probe commands. They were not
being accepted due to a borked mantissa check.

doc/log/commit_log_v1.1.txt

@@ -1,3 +1,40 @@
+----------------
+Date: 2016-11-04
+Author: Sonny Jeon
+Subject: Improved constant laser power per rate mode. Re-factored for flash size. Minor bug fixes.
+
+- NOTE: This commit has largely been untested.
+
+- Constant laser power per rate mode has been improved. Altered its
+implementation to be more responsive and accurate.
+
+- Based on LaserWeb dev feedback, only G1, G2, and G3 moves operate
+with constant laser power mode. Meaning that G0, G38.x, and $J jogging
+motions operate without it and will keep a constant power output. This
+was specifically requested as a way to focus the laser by keeping the
+laser on when not moving. Operationally, this shouldn’t alter how the
+laser mode operates.
+
+- Re-factored parts of the g-code parser and g-code state reports to
+save a few hundred bytes of flash. What was done makes the code a bit
+more unreadable (bad), but the flash space was in dire need. So, I’m
+willing to live with it for now.
+
+- Fixed a problem with $G g-code state reports. Showed `M0` program
+pause during a run state. Now fixed to show nothing during a run state.
+Also, `M30` program end was shown as `M2`. This was also corrected.
+
+- Improved spindle stop override responsiveness by removing the
+enforced spindle restoring delay. It’s not needed for a feature that is
+user controlled.
+
+- Fixed a bug with G2/3 arcs in inverse time mode.
+
+- Updated the interface.md document to make it more clear how WPos: or
+MPos: can be calculated from WCO:. Some GUI devs have failed to catch
+this in the documentation.
+
+
 ----------------
 Date: 2016-10-27
 Author: Sonny Jeon

grbl/gcode.c

@@ -151,7 +151,7 @@ uint8_t gc_execute_line(char *line)
             word_bit = MODAL_GROUP_G0;
             gc_block.non_modal_command = int_value;
             if ((int_value == 28) || (int_value == 30) || (int_value == 92)) {
-              if ((mantissa != 0) || (mantissa != 10)) { FAIL(STATUS_GCODE_UNSUPPORTED_COMMAND); }
+              if (!((mantissa == 0) || (mantissa == 10))) { FAIL(STATUS_GCODE_UNSUPPORTED_COMMAND); }
               gc_block.non_modal_command += mantissa;
               mantissa = 0; // Set to zero to indicate valid non-integer G command.
             }                
@@ -166,10 +166,11 @@ uint8_t gc_execute_line(char *line)
             word_bit = MODAL_GROUP_G1;
             gc_block.modal.motion = int_value;
             if (int_value == 38){
-              if ((mantissa != 20) || (mantissa != 30) || (mantissa != 40) || (mantissa != 50)) {
+              if (!((mantissa == 20) || (mantissa == 30) || (mantissa == 40) || (mantissa == 50))) {
                 FAIL(STATUS_GCODE_UNSUPPORTED_COMMAND); // [Unsupported G38.x command]
               }
               gc_block.modal.motion += (mantissa/10)+100;
+              mantissa = 0; // Set to zero to indicate valid non-integer G command.
             }  
             break;
           case 17: case 18: case 19: