Minor bug fix to certain safety conditions.

- Grbl would become unresponsive, if a safety door is reset when active
and then homed immediately after. A system variable was not properly
restored. Now fixed.

doc/log/commit_log_v1.0d.txt

@@ -1,3 +1,15 @@
+----------------
+Date: 2016-05-10
+Author: chamnit
+Subject: Planner and printFloat update.
+
+- Planner model update. Improves performance for machines with
+different accelerations on each axes. Particularly for 3D carving.
+
+- Print float update to print 13 (from 10) characters. Help reduce
+print errors for unusually long floating point values.
+
+
 ----------------
 Date: 2016-04-10
 Author: chamnit

grbl/grbl.h

@@ -23,7 +23,7 @@
 
 // Grbl versioning system
 #define GRBL_VERSION "1.0d"
-#define GRBL_VERSION_BUILD "20160510"
+#define GRBL_VERSION_BUILD "20160831"
 
 // Define standard libraries used by Grbl.
 #include <avr/io.h>

grbl/main.c

@@ -80,6 +80,7 @@ int main(void)
     sys.abort = false;
     sys_rt_exec_state = 0;
     sys_rt_exec_alarm = 0;
+    sys.step_control = STEP_CONTROL_NORMAL_OP;
     sys.suspend = false;
     sys.soft_limit = false;