[cg_list_neighbors] comments
[sort_segment_list] another sortable type, this time for merging of MPI messages
[merge_segments] added stub type for merging segments
[sortable_list] remove non-essential methods from the abstract type
collected info on segments to communicate on current level
[sort_segment_list] provided safe [lu]_bound values for non-allocates lists
sorted the lists of segments
computed offsets within the lists of segments
added pointer to source/target grid container to the list of segments
[merge_segments] do not use merged MPI on local boundaries when there is a local communication without pointer to right grid container set.
[cg_list_neighbors] comment
remember also the direction of segments to be merged for MPI
[cg_list_bnd] internal_boundaries split into local and MPI exchanges
[cg_list_bnd] moved some duplicated code to a better place
moved %ms from cg_list_neighbors_T to cg_list_bnd_T
[cg_list_bnd] stub of a new routine: internal_boundaries_MPI_merged
[cg_list_bnd] constructing internal_boundaries_MPI_merged (WIP)
[cg_list_bnd] constructing internal_boundaries_MPI_merged (WIP)
[cg_list_bnd] constructing internal_boundaries_MPI_merged - looks like finished
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