fixed minor typo in gravity.mat_lmax; implemente per-coefficient scaling in  garvity.unit; simplified remaining gravity.unit_* members; implemented loading internal CSR model format; added vectort time to gravity.test and revised its output; fixed per-coefficient setting/getting to handle vector time (previously called do); fixed bug in set.mat; simplified the scale member; minor revision of the plot member; fixed minor bug in aux function keyword_search
fixed minor typo in gravity.mat_lmax; implemente per-coefficient scaling in  garvity.unit; simplified remaining gravity.unit_* members; implemented loading internal CSR model format; added vectort time to gravity.test and revised its output; fixed per-coefficient setting/getting to handle vector time (previously called do); fixed bug in set.mat; simplified the scale member; minor revision of the plot member; fixed minor bug in aux function keyword_search

jgte/orb,jgte/orb,jgte/orb,jgte/orb,jgte/orb