Inform

- Added documentation (inform.readthedocs.org).
- Added ability to override template in *Error*.
- Added *stream_policy* option.
- Added *notify_if_no_tty* option.
- Informers now stack, so disconnecting from an existing informer reinstates the previous informer.
- Generallize *cull*.
- Add support for multiple templates.
- Add *join* function.

Add column() utility functions
Add user-specified indenting to render()
Add sss()
Added support for template named argument to report and Error().

This release renames InformantGenerator to InformantFactory.
This release is not backward compatible.

Minor release that adds the new debug functions.