[svn-r19457] Bug fix for 1707 - H5Eset_auto causes a seg fault when an application uses -DH5_USE_16_API with the 1.8 library to compile. The cause is from the mismatch of H5Eprint1 and H5Eprint2 set
through H5Eset_auto. I changed the union in the structure H5E_auto_t. Another change is to
make H5Eget_auto fail if H5Eset_auto is called to set the printing function. I'll write a
document for it.
Tested on heiwa, jam, and amani.
The property change in configure.in, config, and Makefile.am came from the merge of the 1.8
library change.
