netcdf-c

1. There were several bugs in ncdump/dumplib.c
   that were not taking the CDF-5 format into account.

2. Had to update ncgen.1 man page to define the new
   k-flag rules to deal with cdf-5.

3. Had to fix some tests that use 'cmp' for comparison;
   this really should be deprecated.

3. There was a bug in configure.ac with respect
   to using the enable-netcdf-4 flag vs
   using disable-netcdf-4.