hdf5_ep

[svn-r2586] Purpose:
	Bug Fix
Description:
	The prototype for the H5Pregister function has a variable named
	`class'. This is a reserved word in C++ and causes the C++
	compiler to freak.
Solution:
	This variable's name was changed to cls_id in the .c file, so I
	changed it in the header file to cls_id to match.
Platforms tested:
	Linux