helpers: replace webhelpers.flash with own implementation webhelpers is dead. One small function implements pretty much the same functionality, using the same session key so tests still pass, but also very simple and without external dependencies. It could be implemented with a class and different methods for adding, getting and clearing. But internally, it would probably have pretty much the same helper function has here. So let's just avoid the unnecessary complexity and keep it simple.

[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
    #
    --doctest-modules
    --doctest-ignore-import-errors