vchoi_fork

[svn-r10008] Purpose:  Bug fix

Description:  When hardware conversion between "long double" and integers was added to the
library, the "double" used in H5T_CONV_Fx and H5T_CONV_xF for alignment wasn't big enough for
"long double".  New macros H5T_CONV_Lx and H5T_CONV_xL were added to use "long double" for
alignment.  But later it's found out the new macros were not necessary.

Solution:  Took out the new macros H5T_CONV_Lx and H5T_CONV_xL; change the "double" to "long
double" for alignment in H5T_CONV_Fx and H5T_CONV_xF.

Platforms tested: h5committest