set the compareAllPoissonKernel in private part of the git, in order to keep public user from trying to build the uniform part

Valgrind reveals usage of temp string in text replacer (create real object to avoid wrong mem access)

# By piacibel
# Via piacibel
* 'master' of git+ssh://scm.gforge.inria.fr//gitroot/scalfmm/scalfmm:
  Add mechanism to reset the tree in the API

I remove criteria on energy.