Add .gitignore
Add missing bracket
Make the Makefile a bit more versatile, add clean
Restructure code a bit
Add missing paren
Add debug target to Makefile

This target adds gdb symbols and defines DEBUG as 1.
Change some comment formatting
Add initial PCB and PCB heap code, fix Makefile
Add pop min function and insert stub
Clean up whitespace
Fix some compiler errors
Add some fields to PCB
Add code for reading PCBs from stdin, add stubs