Create fch from pyscf mol

Flow chart py2fch_direct.mol2fch(mol) -> molinfo2fch (in py2fch.so) -> write_fch (in read_fch.f90)

we may also add python wrapper for py2fch.py2fch in lib/py2fch_direct.py

ongoing work:

• ECP support
• check normalization
• check ang moment L(SP)
• check other blocks in fch (atom mass, etc)