Update %!tests in src/ directory with Octave coding conventions. * data.cc, defaults.cc, dirfns.cc, file-io.cc, graphics.cc, mappers.cc, oct-map.cc, octave.cc, ov-base.cc, ov-bool-mat.cc, ov-cell.cc, ov-fcn-handle.cc, ov-fcn-inline.cc, ov-flt-re-mat.cc, ov-int16.cc, ov-int32.cc, ov-int64.cc, ov-int8.cc, ov-null-mat.cc, ov-oncleanup.cc, ov-range.cc, ov-re-mat.cc, ov-struct.cc, ov-typeinfo.cc, ov-uint16.cc, ov-uint32.cc, ov-uint64.cc, ov-uint8.cc, ov.cc, pr-output.cc, pt-binop.cc, pt-eval.cc, pt-idx.cc, pt-mat.cc, sighandlers.cc, strfns.cc, symtab.cc, syscalls.cc, sysdep.cc, toplev.cc, utils.cc, variables.cc: Update %!tests in src/ directory with Octave coding conventions.