checker: make run_ignore_1() a bit more flexible by adding codes argument

incoming: use a list of regular expressions to extract linter output type

incoming: move linter output matching to a function, test it

tests: pass extra arguments given to run-tests.py into pytest.main()

incoming: save filename and line number for linter output in Check.lines

incoming: use dicts instead of tuples for Check.lines

models: add Project.get_title() method, use it, test it

incoming: parse_project_url() function to extract domain, user and name, tests

viewer: use a lineno class to put styles on the line number links

incoming: only try to match linter output if it's not a meta line