Changed constant 0 to 0_size_t to use the correct type in the h5tinsert_f subroutine. Platfomr tested: Elena's mac air with gfortran 4.6
Items merged: fortran directory, src/libhdf5.settings.in configure.in configure MANIFEST Tested: (all platforms used by daily tests, both with --enable-fortran and --enable-fortran2003)