h5check

Bug fix: ID 1650

Here is a quick list of the problems and actions I took.
These three files are installed by the current version:
   bin/h5check    OK. Kept as is.

   bin/testgen    Incorrect since it generates test files and is not a user tool.
                  I have removed it from the install list.

   lib/libh5check.a  
                  Though the implementation design provides the ability that this library
                  can be used by user applications but it is pre-mature to install it because
                  the related header file is not installed and no API definition document
                  exists yet, I think. Therefore, I am removing it from the install
                  list.

Tested:
Jam, Amani, Linew.