TODO for PIR Zmachine
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KNOWN_BUGS
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- The generated PIR subs accept no options INTVAL arguments,
  as argcI has become obsolete

OPCODES: about 1/3 of V3 is working
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Done: 20
- jumps: jl jg jz jump
- math: add sub mul div mod
- logical: or and not
- variables (indirect): inc dec
- subroutines: ret rtrue rfalse
- print: print print_paddr print_num

Mostly done: 5
- jumps: je
- variables (indirect): store
- print: print_ret
- subroutines: call
- state: quit

Not done but not hard: 18
- variables (indirect): dec_chk inc_chk
- variables (indirect): load pop push pull
- logical: test
- memory: loadw loadb storew storeb
- subroutines: ret_popped
- print: print_addr new_line print_char
- misc: nop verify random

Not done and bigger jobs: 23
- I/O (non-print): sread show_status split_window set_window output_stream
- state: save restore restart
- objects: jin insert_obj get_sibling get_child get_parent remove_obj print_obj
- attributes: test_attr set_attr clear_attr
- properties: get_prop get_prop_addr get_next_prop get_prop_len put_prop

V4 and V5 opcodes...


INCOMPLETE
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- je with >2 arguments (at least throw an error)
- subs: set local defaults, get correct nlocals
- decode_text abbrev
- print_paddr variable address (and other opcodes taking vars)
- print abbreviations, Zchars > 127
- indirect varaibles taking vars
- debug option

INFRASTRUCTURE
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- Create an include file with macros (and classes, if any)?