Reomved pointless bra and moved the message to teh bottom of the prog.
Added/Changed:

* Musical routines are a bit more friendly. Feed a sub an array of note
numbers instead of the registers themselves.
* Changed the boot beeps to use the above routine.
* Added a simple xmodem routine for reading a file from the serial port
into RAM.
* Changed delays back to the 4Mhz crystal values.
* Fixed the register printing to cope with userspace changing the stack
pointer by stashing the stackpointer away in a var when the monitor is
entered.
* Moved the USERSTACKEND to the hardware.inc file.