Removes Initialize and InitializeMat methods from invmed_tree. Replaces
with a SetupInvMed method which ensures that all trees are created
adaptively and have the same structure. Removes Copy and NewFunc methods
from the class. Many variables have been moved to static variables
because they are all the same for each of the functions and this
simplifies the set up of the trees. Test file has been substatnially
changed to reflect the changes in the invmed_tree class. invmed.cpp has
been changed to reflect these changes as well. Still is not working--
segfault upon trying to run FMM on a tree for which the setup has not
been run.