Initial v0.8 ALPHA commit. Features multi-tasking run-time command execution (feed hold, cycle start, reset, status query). Extensive re-structuring of code for future features.

- ALPHA status. - Multitasking ability with run-time command executions
for real-time control and feedback. - Decelerating feed hold and resume
during operation. - System abort/reset, which immediately kills all
movement and re-initializes grbl. - Re-structured grbl to easily allow
for new features: Status reporting, jogging, backlash compensation. (To
be completed in the following releases.) - Resized TX/RX serial buffers
(32/128 bytes) - Increased planner buffer size to 20 blocks. - Updated
documentation.

settings.c

@@ -177,9 +177,7 @@ void settings_store_setting(int parameter, double value) {
 
 // Initialize the config subsystem
 void settings_init() {
-  if(read_settings()) {
-    printPgmString(PSTR("'$' to dump current settings\r\n"));
-  } else {
+  if(!read_settings()) {
     printPgmString(PSTR("Warning: Failed to read EEPROM settings. Using defaults.\r\n"));
     settings_reset();
     write_settings();