Added functionality for manipulating NEP restart files

Eric Lindgrenrequested to merge
114-add-functionality-for-manipulating-nep-restart-files into master

Closes #114 (closed)

Todos

  • read and write nep.restart
  • modify restart information
    • remove species
    • clear/convenient way for setting means and variances; separately for descriptor, network, and possibly by species
  • synchronize with reading/writing nep.txt (needed when removing species)
Edited by Eric Lindgren

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