pullrequests: optimize iteration over reviewers - avoid fetching users one by one .reviewers was mainly used for iteration and then dereferencing .user one by one. That gave lots of queries and round trips to the database and was slow. Instead, do something else. Either query directly or use a new method for getting the list of reviewer users. Reviewers will explicitly be shown in the order they have been added (assuming database id's are monotonic).

[pytest]
# only look for tests in kallithea/tests
python_files = kallithea/tests/**/test_*.py
addopts =
    # --verbose
    # show extra test summary info as specified by chars (f)ailed, (E)error, (s)skipped, (x)failed, (X)passed, (w)warnings.
    -rfEsxXw
    # Shorter scrollbacks; less stuff to scroll through
    --tb=short