Amend license and authors
ignorance
First stab at tree walker (Thanks to B.xs)
Move C code to src
Better OP description
Test/debug output for jittable ops
Compiler warnings and compile-time debug constant PJ_DEBUGGING

Also: PJ_DEBUG() and friends for conditional printf debugging.
Make debug output conditional
Do not run old JIT code any more

Also: Run original peephole optimizer AFTER the JIT. This means that we
don't have to fuzz with op_next. Big difference.
C compile-time debugging constant
Use new debugging mechanism throughout
Fix compiler warnings
Apparently, peep is not called on the very top-most leave?