Add "save to CSV" method to the PublicationVenue model

[tompollard]

Right now, we populate the PublicationVenue data structure with information like: (1) number of papers (2) whether or not those papers mention PhysioNet.

We don't save the information anywhere, so it gets lost after an analysis is complete. We should add a save_to_csv method to the PublicationVenue class so that we can record data to CSV at the end of an analysis.

physionet-25-years/src/twentyfiveyears/models.py

Lines 16 to 42 in 9405e4c

	class PublicationVenue:
	"""
	A class to represent a publication venue (either a conference or journal).
	Attributes:
	title (str): Full title of the venue.
	shortname (str): Abbreviated name of the venue.
	year (int): Year the venue was held or published.
	publications (list of Publication): List of publications.
	"""
	def __init__(self, title, shortname, year, path, publications=None):
	"""
	Constructs all the necessary attributes for the publication venue.
	Parameters:
	title (str): Full title of the venue.
	shortname (str): Abbreviated name of the venue.
	year (int): Year held or published.
	path (str): Path to folder containing publications.
	publications (list of Publication, optional): List of publications.
	"""
	self.title = title
	self.shortname = shortname
	self.year = year
	self.path = path
	self.publications = publications if publications is not None else []