Correctly implement option to define path where radio data files should be saved

[jgieseler]

Right now, when radio data is used in the dynamic_spectrum tool, the data is downloaded to the default path used by sunpy's fido. But the loading function actually already has the option to define a path included, it's just not used in the call from tools/__init.py__:

SEPpy/seppy/tools/__init__.py

Line 97 in e9f4ecb

self.radio_files = get_swaves(start_date, end_date)

SEPpy/seppy/tools/swaves.py

Lines 16 to 35 in e9f4ecb

	def get_swaves(start_time, end_time, path=None):
	#######################
	# downloading the files
	#######################
	dataset = 'STEREO_LEVEL2_SWAVES'
	cda_dataset = a.cdaweb.Dataset(dataset)
	trange = a.Time(start_time, end_time)
	# always add 1 day to enddate because the enddate itself should be included in the data (which isn't the case)
	trange = a.Time(start_time, trange.end.to_datetime().date()+datetime.timedelta(days=1))
	result = Fido.search(trange, cda_dataset)
	downloaded_files = Fido.fetch(result, path=path) # use Fido.fetch(result, path='/ThisIs/MyPath/to/Data/{file}') to use a specific local folder for saving data files
	downloaded_files.sort()
	# print(downloaded_files)
	return downloaded_files

Not completely sure if just Event.data_path should be used for it if defined, or if we should introduce another radio_data_path

SEPpy/seppy/tools/__init__.py

Lines 37 to 39 in e9f4ecb

	def __init__(self, start_date, end_date, spacecraft, sensor,
	species, data_level, data_path, viewing=None, radio_spacecraft=None,
	threshold=None):