remove unused macros

git-svn-id: https://svn.mcs.anl.gov/repos/parallel-netcdf/trunk@1755 c368ceb8-fd28-0410-a457-e46ee1d7cd4a
check floor instead of tanh, as floor is used in test/nc_test/util.c

git-svn-id: https://svn.mcs.anl.gov/repos/parallel-netcdf/trunk@1756 c368ceb8-fd28-0410-a457-e46ee1d7cd4a
remove some conigure tests that either we don't use; add note on checking yacc/bison

git-svn-id: https://svn.mcs.anl.gov/repos/parallel-netcdf/trunk@1757 c368ceb8-fd28-0410-a457-e46ee1d7cd4a