report/log: Fix showing HTML special chars in statistic table pop-up.

Fixes #1767.
Process: 1) Own test suite for env config, 2) Better error if using invalid kwargs.
Process tests: Renamed resource file.
Process tests: Separate suite for passing arguments to processes and some other cleanup.
Process: Fixed newly added tests for passing arguments that didn't work on Windows. Also enhanced them otherwise.
Process tests: Workaround for some weird IronPython bug/feature.
Process: Convert process arguments to strings automatically.

Fixes #1738.