[svn-r17052] Add a run to the h5repack shell script to read a family file

The file used for input is located in the common source tools for testfiles, in tools/testfiles
Modified the h5repack shell script to read files from this location (h5repack reads its input files from a dedicated testfiles location in h5repack/testfiles)
Changed the h5diff open file call to use h5tools_fopen, so that it can open all file drivers

Tested: windows, linux, solaris

tools/h5diff/h5diff_main.c

@@ -68,6 +68,9 @@
  */
 
 
+/* module-scoped variables */
+int d_status = EXIT_SUCCESS;
+
 int main(int argc, const char *argv[])
 {
     int        ret;