Prepost

Merging the prepost module into the toolbox. Some aspects in dlc.high_level need to re-evaluated at a later stage: the year and k_shape parameters should be part of the dlc post processing configuration file.

See merge request !1

more PY2 vs PY3 differences that required a change: new line character is 1 char in PY3, passing dict as kwargs when calling a function

integrate dlc.high_level with prepost.Simulations, use pandas for Excel reading in dlc.high_level, cosmetic changes