[svn-r21236] Purpose:

Work for:
   HDFFV-7515 - GMQS: h5unjam - incorrect help page and should display when 
   no file is given.
   and
   HDFFV-5941 - h5jam: specifying a user block file with a proper HDF5 magic
   number will result in a corrupted HDF5 file.


Description:
   - Revised command help pages of h5jam and h5unjam. The descriptions
     were not up to date and some were missing. (HDFFV-7515)
   - Fixed h5jam not to allow specifying an HDF5 formatted file as input 
     file for -u (user block file) option, because the original HDF5 file 
     will not be accessible if allows. (HDFFV-5941)

Tested:
    jam (linux32-LE), koala (linux64-LE), heiwa (linuxppc64-BE), tejeda (mac32-LE), linew (solaris-BE), Cmake (jam, Wondows)

tools/h5jam/testfiles/h5jam-help.txt

@@ -1,9 +1,24 @@
-usage: h5jam -u user_block_file -i h5_file [-o ofile | --clobber] 
-           Add 'user_block_file' to front of 
-           'h5_file', pad so 'h5_file' starts on proper
-           byte.
+usage: h5jam -i <in_file.h5> -u <in_user_file> [-o <out_file.h5>] [--clobber]
 
-       h5jam -h 
-           Print a usage message and exit
-       h5jam -V 
-           Print HDF5 library version and exit
+Adds user block to front of an HDF5 file and creates a new concatenated file.
+
+OPTIONS
+  -i in_file.h5    Specifies the input HDF5 file.
+  -u in_user_file  Specifies the file to be inserted into the user block.
+                   Can be any file format except an HDF5 format.
+  -o out_file.h5   Specifies the output HDF5 file.
+                   If not specified, the user block will be concatenated in
+                   place to the input HDF5 file.
+  --clobber        Wipes out any existing user block before concatenating
+                   the given user block.
+                   The size of the new user block will be the larger of;
+                    - the size of existing user block in the input HDF5 file
+                    - the size of user block required by new input user file
+                   (size = 512 x 2N,  N is positive integer.)
+
+  -h               Prints a usage message and exits.
+  -V               Prints the HDF5 library version and exits.
+
+Exit Status:
+   0   Succeeded.
+   >0  An error occurred.