* A version tag is now available in .version (it contains the headline of the last git checking)
* Solana command-line tools are now installed
* Removed nasty workaround for pyserum event queue, since Binder didn't like it.
* This is a big change that touched most files in the project.
* Library code is now an actual package, in /mango.
* Pure .py files used for shared code - easier to edit/debug, and should ease move to installable package later.
* Removed many notebooks. The remaining notebooks are useful 'display'/'show' notebooks for investigating Mango objects.
* More tests! The test story is now much improved, but more unit tests are still needed.
* There's now a Makefile for project operations.
Geoff Taylor