basic trajectory_analysis tools

modules/geom/src/vec3.hh

modules/mol/alg/pymod/CMakeLists.txt

modules/mol/alg/pymod/export_trajectory_analysis.cc

modules/mol/alg/pymod/wrap_mol_alg.cc

modules/mol/alg/src/CMakeLists.txt

modules/mol/alg/src/trajectory_analysis.cc

modules/mol/alg/src/trajectory_analysis.hh

modules/mol/base/pymod/export_coord_group.cc

modules/mol/base/src/coord_frame.cc

modules/mol/base/src/coord_frame.hh

modules/mol/base/src/coord_group.cc

modules/mol/base/src/coord_group.hh