redundancy in the download of the flag and adjustment files

[BaptisteVandecrux]

Right now it is done through a git pull before running pypromice and later on re-downloaded in _getDF:

pypromice/src/pypromice/qc/github_data_issues.py

Lines 308 to 325 in a7997ef

	def _getDF(flag_url, flag_file, download=True):
	'''Get dataframe from flag or adjust file. First attempt to retrieve from
	URL. If this fails then attempt to retrieve from local file
	Parameters
	----------
	flag_url : str
	URL address to file
	flag_file : str
	Local path to file
	download : bool
	Flag to download file from URL
	Returns
	-------
	df : pd.DataFrame
	Flag or adjustment dataframe
	'''

I'll remove the download option from _getDF so the CSV files will only be updated through the git sync prior running pypromice

[BaptisteVandecrux]

fixed in #229