hdf5 installed without zlib should configure without zlib so first check if without zlib works
hdf5: fix so that -Lpath is also used in hdf5 lib check. [fixes --download-hdf5]
name of configure generated include file confdefs.h did not match name printed in configure.log of conftest.h
put back in flop counts for VecNorm_Seq
Merged in barry/fix-conftest-h (pull request #72)

name of configure generated include file confdefs.h did not match name printed in configure.log of conftest.h
Merged in barry/fix-hdf5 (pull request #67)

hdf5 installed without zlib should configure without neededing zlib dependency