Mpm Object File Level 03: Store instruction PC ($PC) in Expression section

Mpm V1.9.12 and earlier defined the $PC (or $) during linking as the patch position of where to apply re-calculated expression with correct linking addresses. This has been a fundamental incorrect assumption and exposed the JR $ (should jump to it self). This problem was reported by vasil31@gmail.com:

 MPM versions: 1.9.1 - 1.9.13

command line: mpm.exe -v -a -b -otest.bin test.asm

---- test.asm ---------- 
org 100h

ld  hl,$      ; MPM -> hl = 0101h;  Must be: hl = 0100h
ld  hl,$      ; MPM -> hl = 0104h;  Must be: hl = 0103h

org 100h

jp $     ; C3 00 01  (All Assemblers)  -- the eternal cycle.
jp $     ; C3 01 01  (MPM)  -- crash

org 100h

jr $     ; 18 FE     (All Assemblers)  -- the eternal cycle.
jr $     ; 18 FF     (MPM)  -- crash

The assembler $PC must define the position of the first opcode of the CPU instruction and first byte of a data directive (defb, defw, etc).