Added a 4-nibble BCD display/converter component - pageup/pagedown when placing a new hexidecimal display component to switch to placing this 7-digit decimal display.

Added a 4-bit Comparator component.

Redid my scripting on the ALU.

This is definitely the macrochips most complicated component yet! Added a 4-bit ALU (Arithmetic Logic Unit.) Manual page still needs to be done. Works mostly as a 74181 ALU chip, see http://i.imgur.com/heDUkaO.png for its datasheet, taking two unsigned Input nibbles A and B on which it performs the function operation as determined by its M / S / C-in Inputs. The chip itself shows what function is being run.

I'm no electrical engineer so can't promise this component fully works as one should do! Anyone who _does_ know about these things, if you test this and find it satisfactory, let me know, cheers! :)

Bug fix for a crash from multi remote node component.