Renamed remap_distwgt() to remap_knn

src/CMakeLists.txt

src/Makefile.am

src/Remapgrid.cc

src/Remapweights.cc

src/Verifyweights.cc

src/remap.h

src/remap_knn.cc

src/remap_scrip_io.cc

src/remap_utils.cc

src/remap_vars.h

src/remaplib.cc