Basic VM and other minor improvements.

Not complete, probably not fully debugged or optimized.

lib/syslib/vm_brk.c

@@ -0,0 +1,19 @@
+
+#include "syslib.h"
+
+#include <minix/vm.h>
+
+/*===========================================================================*
+ *                                vm_brk				     *
+ *===========================================================================*/
+PUBLIC int vm_brk(endpoint_t ep, char *addr)
+{
+    message m;
+    int result;
+
+    m.VMB_ENDPOINT = ep;
+    m.VMB_ADDR = (void *) addr;
+
+    return _taskcall(VM_PROC_NR, VM_BRK, &m);
+}
+