Docs: Add extra documentation
Docs: More doc changes, comments and logging.

This contains comments, logging fixes and PEP8 fixes sprinkled thoroughout
Save and Delete: make calls on object

this brings the save / delete calls onto the CNXBase objects.  Previously we
used the recommended SQLAlchemy way of magically having dbsession in module
namespaces.  I have explicitly passed the dbsession now into save call, so
avoids a little bit of magic.  (We still deal with the magic of SQLA)
Add in own HTTPException handling

rather than rely on flask.abort, we raise an Exception class.  THis both
decouples us from Flask, and means we can raise an error in security,
and then let it bubble up, or catch and handle as needed.  For exmaple it
is valid for a folder you own to hold modules you dont, so an attempt to
read folder contents will result in a exception, but is not a 400 error.
Standalone: allow URLMap to act as proxy

for dev only, URLMap can be used to serve static files as if it was a front end load balancer
Dbase field changes

roletype security has no need of last modified - converted to start end dates
user and identity changes, ensuring consistent approach

Create a consistent approach to naming of user, user_uri etc.
Remove routing for static work from views

The routing for static fviews should be in URLMap or nginx not in the app itself