DP offset instructions, new demo programs.

Added DPUP and DPDN, which take a one byte operand specifying how far up or down to offset the Data Pointer.
Three Fibonacci generators using the print.asm library.
 - 8 bit values printing in decimal representation.
- 16 bit values printing in hexadecimal representation.
- 32 bit values printing in hexadecimal representation.

Programs/Fibonacci/8bitFibonacci.asm

@@ -0,0 +1,33 @@
+; A Fibonacci number generating program that uses only one byte to store the value.
+
+#Include Libraries/print.asm
+
+#Program
+start:
+  ; Load our initial values into A and B.
+  INIA 0x00
+  CALL printByteDecimal
+  CALL blankSpace
+  ; Move the value into B.
+  PSHA
+  POPB
+  ; Load the next starting value into A.
+  INIA 0x01
+  CALL printByteDecimal
+  CALL blankSpace
+ loop:
+  ADD                       ; Add the values together.
+  BRC end                   ; If the value overflows, we're done.
+  ; Copy A into B
+  PSHA
+  POPB
+  ; Copy Q into A
+  PSHQ
+  POPA
+  ; Print A.
+  CALL printByteDecimal
+  CALL blankSpace
+  BRI loop                  ; Loop again.
+ end:
+  CALL lineFeed
+  HALT