* main: move tests to main/tests
Move the templatetags tests to main/tests/test_templatetags.
* main: Add test for templatetags country
Create a test for the templatetag country_flag.
* main: remove duplicate floatvalue
floatvalue is only used in the mirrors templates and the same exact
function exists in the mirror_status templatetags.
* main: Remove duplicate hours filter
The hours filter is also defined in the mirror_status and only used in
mirrors.
* main: move percentage filter to mirrors
Move the percentage filter to the only user of it and add a test for
basic use cases.
* main: remove duplicate duration implementation
The duration templatetag filter is also defined in mirror_status.py
* templates: remove unrequired import flags
* main: Add missing testcase for country_flag
Add the None test case, so that the function is fully covered.
* todolists: create tests for Todolist model
Add basic tests for the Todolist model
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