Add a couple of pseudo instructions to the R5900 disassembler and display signed immediates as signed
Add branch pseudo opcodes to R5900 disassembler
Make simplifcations in the disassembler optional
Simplify disassembly of memory access with zero offset
Add shared source and dest register simplifications
Merge pull request #255 from Kingcom/Disasm

Add a couple of pseudo instructions to the R5900 disassembler