getNoteTags returns [str ...] of tags for a given note (note: int)
updateNoteTags removes the existing tags and sets new tags
updateNote combines the old updateNoteFields and the new updateNoteTags
Closes#369
Previously, tests were run against Anki launched by user.
Now,
* most tests run against isolated Anki in current process;
* tests in `test_server.py` launch another Anki in a separate process
and run a few commands to test the server;
* nearly all tests were preserved in the sense that
what was being tested is tested still.
A few tests in `test_graphical.py` are skipped due to
a problem with the method tests, see the comments;
* tests can be run:
* In a single profile, using --no-tear-down-profile-after-each-test;
* In a single app instance, but with the profile being torn down
after each test--default;
* In separate processes, using --forked.
* Fix error message in updateNoteFields method
* Fix error handling in cardsInfo, notesInfo methods
* Add more tests for updateNoteFields, notesInfo
* Fix error handling in several methods
Also fixed obvious bugs in replaceTags and replaceTagsInAllNotes
methods.
* Add more tests for cards methods
* Add more tests for notes methods
* Update documentation on cards methods
