Fixup: order does matter
AFAIR, this was the historical "feature" to enable TIP3P "solute" calculation. There...
gen_structure for NAMD incorrectly splits solvent into solute and the solvent
Replace pseudo random number generator
rev. 6b516f added the RNG.
Miscommit: added xorshift1024star.f90 for RNG
Replaced slvfe.F90 which failed to merge
Implemented RNG for #43. Untested atm.