netcdf-c

NetCDF-c Github issue #178
NetCDF-c Github issue #178 / esupport BNL-694121

The ncgen man pages says:
> Note also that the words variable',dimension', data',group', and
> `types' are legal CDL names, but be careful that there is a space be-
> tween them and any following colon character when used as a variable
> name. This is mostly an issue with attribute declarations.

Ncdump does not obey this rule.
The fix is to modify ncdump/ncdump.c to check if a variable name is
a keyword.

Also added test case.