Trepan

- Revise quit to handle threads

- redo to correct wheel build

- pytest support improvement: Add debug(level=...)
The causes the debugger to skip recent frames used in setup.

- Don't show an error if we can't import bpy or ipython - they are optional
- bug fixes

- add bpython shell.
- eval? of "for VAR in EXPR:" is "EXPR"
- set default completion (not debugger completion) in python shell
- Save/restore ipython completion if we can do so
- don't highlight prompt when highlight is plain/off
- add line completion on tbreak and break
- Add syntax help and go over docs, add links to readthedocs

- Include instruction number in location
- whatis: more info via Python3 inspect
- align disassembly more with dis.dis.
- Add "info *" and "info arg1, arg2".
- Add "info frame *number*
- Set/check max args in subcommands
- Add completion on "tbreak", "break" and "set highlight"
- Don't highlight prompt when highlight is plain or off
- eval? picks out EXPR in for VAR in EXPR:
- Update online-help