Added option to erase OpenQuake HDF5s and job entries

Every time the OpenQuake engine is run, it stores results in an HDF5 file and lists the corresponding job within its results database. This occupies disk space and, given that the Real Time Loss Tools are likely to be running a very large number of earthquakes, it is important to have the option to erase these HDF5 files as the software runs. This MR addresses this by adding the store_openquake option to the config.yml.

Closes https://git.gfz-potsdam.de/cnievas/real-time-loss-tools/-/issues/2.