calculate overlap with nn states during energy evaluation
importance sampling works already...
added check for negative entries in propagator
fixed importance sampling propagator too
adde Target energy
added stabilizing backup walker
just messing about with VMC
get 'load' from vmc
going to try and see why the growth estimate is wrong

probably related to failure of algorithm
instability originates from peps overlap calculation

FIX IT!!!!
something MUST be wrong with the compression
debugging
add calc_overlap
still debuggin
added better energy to GFQMC
Merge branch 'importance_sampling'

* importance_sampling:
  added better energy to GFQMC
  still debuggin
  add calc_overlap
  debugging
  something MUST be wrong with the compression
  instability originates from peps overlap calculation
  going to try and see why the growth estimate is wrong
  get 'load' from vmc
  just messing about with VMC
  added stabilizing backup walker
  adde Target energy
  fixed importance sampling propagator too
  added check for negative entries in propagator
  importance sampling works already...
  calculate overlap with nn states during energy evaluation

Conflicts:
	Distribution.cpp
	GFQMC.cpp
	Walker.cpp
	include/Distribution.h
	include/Environment.h
	include/Walker.h