[GSoC] Set up HDF5 file for element's periodic data

[gabrielasd]

Translate the current periodic module code and associated CSV files into a HDF5 structure that can be accessed via Species class @Property methods.

Modules associated with this change:
periodic.py
species.py

Data files associated with change:
data csv
data provenance & descrption

Example of current Species property method affected by change:

AtomDB/atomdb/species.py

Lines 472 to 482 in 464f116

	def atmass(self):
	r"""Atomic mass in atomic units.
	Returns
	-------
	atmass : dict
	Two options are available: the isotopically averaged mass 'stb', and the mass of the most
	common isotope 'nist'. For references corresponding to each type check
	https://github.com/theochem/AtomDB/blob/master/atomdb/data/data_info.csv
	"""

Tasks

• Port information in csv files to HDF5 format (e.g., atomic number, symbol, covalent radius, etc.). This step may involve deciding a data schema for the HDF5 file and writing a script to port the data.
• Refactor the periodic module
• Refactor Species to load periodic data from HDF5;relevant function:
  

  AtomDB/atomdb/species.py

  Line 65 in 464f116

  def scalar(method):

  )
• Fix periodic test module