ES6 modules early experience

Docs not yet adapted.
All of the shipment tests should run correctly.
Take a look at the html files of the demo to see how modules are used by them.

To install:

1. Add the directory containing run_transcrypt.bat to the system path (search path) of your OS

2. On the command line, use:

run_transcrypt -b demo (SO NO . py EXTENSION !!)

rather than:

run_transcrypt -b demo.py (As used to be the case)

This is because the main module can now also be a JS-only module.
The compiler just looks what's there.