Introduce Separate K-Point Parameters for Post-Ground State Calculations

[sblisesivdin]

We can define distinct k-point parameters for DOS and band structure calculations. For example:

# DOS Calculation Parameters
DOS_kpts_x = 7
DOS_kpts_y = 7
DOS_kpts_z = 7

# Band Structure Calculation Parameters
Band_kpts_x = 9
Band_kpts_y = 9
Band_kpts_z = 9

Files that will be affected:

• gpawsolve.py
• gg.py
• input files under /examples folder
• "input file keywords" page in documentation at gh-pages branch