Summary

Major changes:

• feature 1: Added 'kpts' storable variable to JDFTXOutputs
  -- Currently only able to obtain from the 'bandProjections' file
• feature 2: Added bandstructure attribute to JDFTXOutputs
  -- Standard pymatgen BandStrucure object
  -- Request-able as a store_var, but functions slightly differently
  --- Ensures 'eigenvals' and 'kpts' are in store_vars and then is deleted
  -- Initialized if JDFTXOutputs has successfully stored at least 'kpts' and 'eigenvals'
  -- Fills projections field if also has stored 'bandProjections'
• feature 3: Added wk_list to JDFTXOutputs
  -- List of weights for each k-point
  -- Currently doesn't have a use, but will be helpful for ElecData initializing in crawfish

Todos

• feature 1: Add reading 'kpts' from the standalone 'kPts' file dumped by JDFTx
• feature 2: Outline how we might initialize BandStructureSymmLine(s) for calculations with explicitly defined 'kpoint' tags, as using 'kpoint's instead of kpoint-folding is most likely an indicator of a band-structure calculation