Assign some shortcut variables
Implement inter-tree corner corners in p4est_mesh
Merge branch 'develop' into wrap
Expose brick connectivity to wrap
Extend mesh example
Merge branch 'develop' into wrap
Prepare p4est_wrap_new_ext constructor
Activate btype argument in p4est_wrap_new_ext
Change hollow status in wrap
Rework wrap iterator to track mirrors
Add two new arguments to p4est_wrap_ext.

Added a p4est_replace_t and a user_pointer argument to the constructor.
The replace function has also been added to p4est_wrap_t and called
in p4est_wrap_adapt during refining, coarsening and balancing.
Merge branch 'develop' into wrap
moved p4est_wrap_new_ext to p4est_wrap.h so we can avoid the circular dependancy caused by having a p4est_replace_t member in p4est_wrap_t
Add LEAF_IS_FIRST_IN_TREE to wrap
Merge 'alex/wrap' into wrap
Add to wrap documentation
Fix warnings
Fix LEAF_IS_FIRST_IN_TREE
Update README
Merge branch 'wrap' into develop