Add Double Cubic Lattice Volume (DCLV). (rdkit#7234)

* Add Double Cubic Lattice Volume (DCLV).

Method to compute the solvent accessible surface area and volume, van der Waals volume, compactness and packing density of a protein. Implemented from:  Frank Eisenhaber, Philip Lijnzaad, Patrick Argos, Chris Sander and Michael Scharf, "The Double Cubic Lattice Method: Efficient Approaches to Numerical Integration of Surface Area and Volume and to Dot Surface Contouring of Molecular Assemblies", Journal of Computational Chemistry, Vol. 16, No. 3, pp. 273-284, 1995.

* refactor

* DCLV is no longer a configuration option

* add to the docs

* standalone test has been removed

* reduce use of pointers as args

* DCLV to catch_tests

* update python wrapper

* add copyright statements

---------

Co-authored-by: greg landrum <greg.landrum@gmail.com>

Code/GraphMol/Descriptors/CMakeLists.txt

@@ -13,6 +13,7 @@ rdkit_library(Descriptors
               AUTOCORR2D.cpp Data3Ddescriptors.cpp MolData3Ddescriptors.cpp
               USRDescriptor.cpp AtomFeat.cpp
               OxidationNumbers.cpp
+              DCLV.cpp
               ${DESC3D_SOURCES}
               LINK_LIBRARIES PartialCharges SmilesParse FileParsers Subgraphs SubstructMatch MolTransforms GraphMol
                  EigenSolvers RDGeneral)
@@ -27,6 +28,7 @@ rdkit_headers(Crippen.h BCUT.h Lipinski.h
               AUTOCORR2D.h Data3Ddescriptors.h MolData3Ddescriptors.h
               USRDescriptor.h AtomFeat.h
               OxidationNumbers.h
+              DCLV.h
               ${DESC3D_HDRS}
               DEST GraphMol/Descriptors)