[svn-r6773]

Purpose: Windows maintenance and code cleanup

Description: There were a lot of places in the source code where varibale
             was declared but never used.

Solution: Cleaned the source code to avoid warnings on Windows and Unix
          platforms.

Platforms tested: arabica, modi4, Windows
                  Probably my environment is wrong on Linux, cannot
                  compile at all when fortran is enabled
                  If daily tests fails tomorrow, this will be my fault
                  but I want to go home now :-)

Misc. update:

src/H5Z.c

@@ -123,8 +123,8 @@ done:
 int
 H5Z_term_interface (void)
 {
-    size_t	i;
 #ifdef H5Z_DEBUG
+    size_t	i;
     int		dir, nprint=0;
     char	comment[16], bandwidth[32];
 #endif

test/dsets.c

@@ -593,7 +593,7 @@ test_max_compact(hid_t fapl)
     herr_t      status;
     int         *wbuf, *rbuf;
     char	filename[1024];
-    int         i, j, n;
+    int         i,  n;
 
     TESTING("compact dataset of maximal size");