Fetchsep

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* opsep: modified onset peak fitting and estimate
* opsep: onset peak changed to max flux if automated algorithm
identifies onset after max
* opsep: better workflow for fetchsep_prepare_obs when starting from
BATCH
* opsep: updates to json output to comply with CCMC schema
* Bugfix: Fix crash in opsep and idsep on certain python installations
when reading in GOES-R data files

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* Fixed bug preventing fluence calculation for differential fluxes
* Improved plots for differential energy channels
* Added capability to move output produced by `opsep` to a target dir
* Updated filenames for plots to contain full zulu string
* Added padding to SEP start and end times in `fetchsep_prepare_obs`
workflow
* Removed unneeded asciitable dependency

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* Fix packaging bug that failed to include and correctly use the CCMC
json templates

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* Fix packaging bug that failed to include the default configuration

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* Add GOES-18 differential and real time integral fluxes; changes
GOES-R integral flux source to CCMC's HAPI API
* Add configuration by user config file in the configparser INI
format, replacing placement of config values in config.py. This
fixes the pip deployment issue whereby a user could not easily
update the code configuration.
* Add --ExportConfig option to opsep & idsep. Users may use this to
prepare a custom configuration.
* Fix: Create necessary output directories instead of crashing if
they don't exist

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* Fix bug preventing command-line scripts from executing in Python
interpreter