Renamed dbl_is_equal() to fp_is_equal()

src/Adisit.cc

src/Afterburner.cc

src/Arithlat.cc

src/CMOR.cc

src/CMOR_lite.cc

src/Collgrid.cc

src/Comp.cc

src/Compc.cc

src/Complextorect.cc

src/Cond.cc

src/Cond2.cc

src/Condc.cc

src/Consecstat.cc

src/Deltat.cc

src/Detrend.cc

src/Diff.cc

src/EOFs.cc

src/EcaEtccdi.cc

src/Enlarge.cc

src/Ensstat.cc