* Otherwise the compiler is not allowed to fold the storage of stdname,
  longname and units into one.

* Localize independent uses of variable timevalue in the respective blocks.
* Merge calls to cdf_get_vara_double for time bounds.
* Move invariant data to text segment.

* This can next be used to create the storage for NetCDF streams.

* The entries of the direct table are smaller than the Iliffe vector,
  even for 4-byte pointers.

* delete_refcount_string contains just this test and is likely to be
  inlined.

* taxis.c contains calls to fprintf.

* clang might warn when isnan (imported from math.h) is implemented as
  C11 generic macro.