Here is a list of all files with brief descriptions:

backuprestore.hh
boundarysegmentiterator.hh
cachedpartitionlist.hh
capabilities.hh	Capabilities for SPGrid
communication.hh
cube.hh
declaration.hh
decomposition.hh
dgfparser.hh
direction.hh
domain.hh	Description of computational domain
entity.hh
entityinfo.hh
entityseed.hh	Entity seed for SPGrid
fileio.hh
geometricgridlevel.hh
geometry.hh
geometrycache.hh
grid.hh
gridlevel.hh
gridview.hh
hierarchiciterator.hh
hierarchicsearch.hh
hindexset.hh
idset.hh
indexset.hh
intersection.hh
intersectioniterator.hh
iostream.hh
iterator.hh
linkage.hh
main.page
mesh.hh
messagebuffer.hh
misc.hh	Miscellaneous helper functions
multiindex.hh
normal.hh
partition.hh
partitionlist.hh
partitionpool.hh
persistentcontainer.hh
referencecube.hh
refinement.hh
spgrid.hh
extensions/superentityiterator.hh	Interface classes for superentity iterators
spgrid/superentityiterator.hh
topology.hh	Topology of a Cartesian grid
tree.hh