ertrie: adjusted the translation mechanisms in the tree
ertrie: added proper translation of addresses at the top level of the tree
ertrie: added a prototype page-table handling file that is _untested_...wanted to push it out for feedback now.

TODO: I'm realizing that the handling of the last level (leafs within
the tree) should probably be wrapped into the main ertrie.h code as
opposed to replicated badly in each implementation.
Merge branch 'master' of github.com:gparmer/Composite