Make starting SkyFit2 easier

[g7gpr]

In https://globalmeteornetwork.groups.io/g/coordinators/message/543 it is identified that some operators have trouble starting SkyFit2.

At present, if SkyFit2 is started without any parameters, it returns an error.

(vRMS) user@machine:~/source/RMS$ python -m Utils.SkyFit2
usage: SkyFit2.py [-h] [-c CONFIG_PATH] [-r] [-t TIME] [-f FPS] [-g CAMERA_GAMMA] [-p GEO_POINTS_PATH] [-n] [--peribg] [--flipud] [-m MASK_PATH] [--flatbiassub] INPUT_PATH
SkyFit2.py: error: the following arguments are required: INPUT_PATH

I suggest that SkyFit2 could load ~/source/RMS/.config, determine the path to the latest captured directory, and start working in that directory, as this is most often the task that people want to achieve.