Un-useful tests

[spco]

We already know that we can condense the existing tests down, or replace them with a better framework. This is just to note that the test short, short_end_of_day, and short_no_pre are all stationary models - the only non-zero concentrations they have are CH3OH and NO2, neither of which then appears in the accompaying .fac file. This isn't very useful.

[rs028]

If I recall correctly all the short* tests are basically just testing the various possible configuration of the environment variables and reading in the contraints.

[rs028]

Somewhat related question. Does each test need to have its own mcm/ folder? (solved by #357)

[rs028]

An INFO.md file with the list and a brief description of each behaviour tests should be added (only for those we keep, not those we plan to delete and/or replace with unit tests).

[rs028]

We also need a better way to log the results of the tests. At the moment one has to scroll up the terminal to see the results of the unit tests, for example, and this could be a pain if there are lots of tests. Maybe some of the output can be redirected to a log file (see also #320).