ArgoFloat handling of mono-cycle profile files

[gmaze]

This PR brings new methods to the ArgoFloat class to list, describe and open one or mono-cycle profile files.

from argopy import ArgoFloat
af = ArgoFloat(WMO)
af = ArgoFloat(WMO, aux=True)

af.describe_profiles()  # Pandas DataFrame describing all available profile files

af.lsp() # Return the full list of profile files

af.ls_profiles() # Return a dictionary with all available mono-cycle profile files (everything under the 'profiles' sub-folder)

# To load one single file, use keys from af.ls_profiles():
ds = af.open_profile(12) # cycle number 12, core file
ds = af.open_profile('1D') # cycle number 1, descending core file
ds = af.open_profile('B15') # cycle number 15, BGC file
ds = af.open_profile('B1D') # cycle number 1, descending BGC file
ds = af.open_profile('S28') # cycle number 28, BGC synthetic file

# To load one or more files, provide cycle number(s) and other attributes:
ds_list = af.open_profiles([1,2,3])
ds_list = af.open_profiles([1,2,3], direction='D')
ds_list = af.open_profiles([1,2,3], dataset='B') # Return 'BGC' B files
ds_list = af.open_profiles([1,2,3], dataset='B', direction='D') # Return 'BGC' B files, descending
ds_list = af.open_profiles([1,2,3], dataset='S') # Return 'BGC' Synthetic files

# If you don't specify cycle numbers, all cycles are loaded:
ds_list = af.open_profiles(direction='D') # Return *all* core descending files

‼️ This PR does not update the documentation and does not implement unit tests.