if ... else if ... -> if ... elif ..
if .. : raise AsssertionError -> assert
Add options --tree=before --tree=after -T expanded to include this
This code ported from decompyle3. x0ret did all the heavy lifting.
As part of tokenization for (de)parsing, we need to do something like a
disassembly, but is is really a little different.
Disassembly, strictly speaking, is done by the xdis module now.
What "ingestion" does is massage the instruction tokens to a form that is
more amenable for parsing.
In sum, ingestion is different than disassembly, although disassembly is
generally the first part of ingestion.
