Fix for HDFFV-10333:

1) Check for valid object header version for a refcount messge
2) Check for invalid fill value size
3) Check for invalid dimension size in a layout message
4) Add --enable-error-stack option to h5stat
5) Add error checks to h5stat.c
6) Add tests to h5stat and h5dump

tools/test/h5stat/testfiles/h5stat_err_old_fill.ddl

@@ -0,0 +1,2 @@
+Filename: h5stat_err_old_fill.h5
+h5stat error: unable to traverse objects/links in file "h5stat_err_old_fill.h5"

tools/test/h5stat/testfiles/h5stat_err_old_layout.ddl

@@ -0,0 +1,2 @@
+Filename: h5stat_err_old_layout.h5
+h5stat error: unable to traverse objects/links in file "h5stat_err_old_layout.h5"

tools/test/h5stat/testfiles/h5stat_err_refcount.ddl

@@ -0,0 +1,2 @@
+Filename: h5stat_err_refcount.h5
+h5stat error: unable to traverse objects/links in file "h5stat_err_refcount.h5"

tools/test/h5stat/testfiles/h5stat_help1.ddl

@@ -22,3 +22,4 @@ Usage: h5stat [OPTIONS] file
                            than 0.  The default threshold is 10.
      -s, --freespace       Print free space information
      -S, --summary         Print summary of file space information
+     --enable-error-stack  Prints messages from the HDF5 error stack as they occur

tools/test/h5stat/testfiles/h5stat_help2.ddl

@@ -22,3 +22,4 @@ Usage: h5stat [OPTIONS] file
                            than 0.  The default threshold is 10.
      -s, --freespace       Print free space information
      -S, --summary         Print summary of file space information
+     --enable-error-stack  Prints messages from the HDF5 error stack as they occur

tools/test/h5stat/testfiles/h5stat_nofile.ddl

@@ -22,4 +22,5 @@ Usage: h5stat [OPTIONS] file
                            than 0.  The default threshold is 10.
      -s, --freespace       Print free space information
      -S, --summary         Print summary of file space information
+     --enable-error-stack  Prints messages from the HDF5 error stack as they occur
 h5stat error: missing file name