- The last part of the module import path is the module name. This also
becomes the Django app name. Apps names have to be unique. Hence,
there is no scope for two different modules with same name but
different load path to exist in the project.
- Most uses of list of loaded modules are dealing with app names instead
of full module load path. This is due to the fact that Django deals
with app names and not module paths.
- It is also somewhat clumsy to access a loaded module as we are
re-importing every time to get access module.
- Simplify all of the above by using app names are module identifiers
and maintaing an ordered dictionary of app names to loadded modules.
- Remove unused imports.
- Minor styling fixes.
When modules were removed, Debian packaging also had to remove them to
avoid errors. When Debian guidelines are following and correspoding deb
helper is used, it creates .dpkg-* files in the module configuration
directory. Plinth tries to load these which causes problems. We should
consider loading files with a known extension in future.
