Add old source code from October-November 2006

Includes Makefiles for Linux hosted Hi-Tech PICC and PICC18 compilers
to build for PIC16F877 and PIC18F452 targets respectively.
Also includes MPLAB 5.72 projects for the same.

The code builds and runs, but doesn't actually read ATA info or
data from a hard drive correctly, at the moment.

The code is also rather messy.