Read molecular xtal without full hydrogen info

[qzhu2017]

In many experimental cif, the crystal coordinates do not have full H positions. We need to generate these positions based on covalent bonding info if the smile is given.

[qzhu2017]

after 16d5fbc

------Crystal from Seed------
Dimension: 3
Composition: [C1C2CC3CC1CC(C2)C3]2
Group: P-421c (114)
tetragonal lattice:   6.6000   6.6000   8.8100  90.0000  90.0000  90.0000
Wyckoff sites:
	H16C10       @ [ 0.0000  0.0000  0.0000]  WP:  2a, Site symmetry -4 . . ==> Euler:   0.00   0.00   0.00
114 0  6.60  8.81 1 0.00 0.00 0.00 -130.0   47.2 -129.1 1 

------Crystal from 1D rep.------
Dimension: 3
Composition: [C1C2CC3CC1CC(C2)C3]8
Group: P-421c (114)
tetragonal lattice:   6.6000   6.6000   8.8100  90.0000  90.0000  90.0000
Wyckoff sites:
	H16C10       @ [ 0.0000  0.0000  0.0000]  WP:  8e, Site symmetry 1 ==> Euler: -130.00  47.20 -129.10

• WP symbol is incorrect
• need to handle hexagonal/cubic xtal