add dump all command; source selection parameters for tev

[vorugantia]

@cdeil - See here for what I've done in make.py and let me know if you have any suggestions:

• Added an option to dump all data to JSON, for use before webpage deployment.
• Added parameters to source_tev() to only write sources in a given start/end range.

[cdeil]

I would suggest to also change the "source_all" and "cat_all" functions to this click method of ctx.invoke on the other steps.

Also, I would suggest to just take a list of source IDs to process. The min/ max range thing is unnecessarily complex, when the main use case is for debugging, you just want to select one or two sources and run those repeatedly until the code works.

I would do this:

@click.option('--sources', default='all', help='Either "all" or comma-separated string of source IDs')

and then to process something like:

cat = # load catalog

# compute sources to process
if sources == 'all':
    sources = list(range(len(cat)))
else:
    sources = [int(_) for _ in sources.split(',')]

# process the requested sources
for idx in sources:
    source = cat[idx]
    # process this source

If you use this pattern multiple times, the four lines that compute the sources to process can go in a helper function that you call multiple times.