Replace cdo_get_wtime() by cdo::get_wtime()

src/CDItest.cc

src/Cat.cc

src/Fillmiss.cc

src/Makefile.am

src/Remapstat.cc

src/Smooth.cc

src/cdo_timer.h

src/cdo_wtime.h

src/process.cc

src/remap_bicubic.cc

src/remap_bilinear.cc

src/remap_conserv.cc

src/remap_conserv_scrip.cc

src/remap_distwgt.cc

src/remap_vars.cc

src/remaplib.cc