Generating Timer Interrupts

The IDE now generates timer interrupts, when the timer control register is enabled.

Only the CHARGE timer registers are used to determine the interval. Minimum interval allowed is 1 millisecond.

Fixed math co-pro error with signed multiplications

Sample code in BASIC:
z=1
z=z*-1
print z

This used to return 65535 in the IDE and -1 on the machine.

release-0.5.3.5: Release 0.5.3.5

Release 0.5.3.5

Made the kernel auto-start, by default.
Fixed the command-line arguments. Added --help.