Fri Jul 25 13:28:59 EDT 2014

Simulator: don't throw away original assembly

For pretty-printing it's probably best to keep the flash structure
operating on target words so the asm can be displayed as it went into
the compiler, i.e. with symbolic names.

This would also allow anotating of address -> containing word.

Ok, done.
A little fidgeting though due to representation of chains/words.