[svn-r23346] First commit for DESY project. It has the basic functionality of loading dynamically filter libraries and a simple test for it.

Tested on koala.

test/plugin_lib/dynlib1.h

@@ -0,0 +1,9 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <hdf5.h>
+
+#define FILTER_DYNLIB1_VERS 1
+
+/* Local prototypes for filter functions */
+static size_t H5Z_filter_dynlib1(unsigned int flags, size_t cd_nelmts,
+    const unsigned int *cd_values, size_t nbytes, size_t *buf_size, void **buf);