Add the option of exporting source parameters to hdf5 #129
Description
Currently, the pyse.py script supports exporting selected parameters of the extracted sources to a .csv format only.
For large sky images, e.g. 4K * 4K, with ~1e5 sources exporting to csv may not be the ideal solution since these csv files may become very large.
We should therefore also provide the option to export to hdf5.
This issue is preferably fixed after PR #127 has been merged, since that will effectuate the selection of source parameters.
Secondly, we may want to differentiate between image and export settings for the cli and for the PySE libraries, e.g. rmsmap and ffbox are currently not effectuated for the libraries. Perhaps this is not a problem, but it should be clear that some parameters only work for the cli. And that if you run PySE from the command line, you need to provide additional settings through a config.toml if you want to apply non-default values.