Default stripesize 64k & config file setting for it;

Clear many compiler warnings (i386) & associated bugs - hopefully without
introducing too many new bugs:-)  (Same exercise required for other archs.)
Default compilation has optimisation - or else use ./configure --enable-debug

lib/misc/sharedlib.c

@@ -8,6 +8,7 @@
 #include "lib.h"
 #include "config.h"
 #include "lvm-string.h"
+#include "sharedlib.h"
 
 #include <limits.h>
 #include <sys/stat.h>