- added script to run mg with valgrind

mk/linux/mg_valgrind.sh

@@ -0,0 +1,13 @@
+#! /bin/sh
+
+exec 3>&1
+export GLIBCPP_FORCE_NEW=1
+export GLIBCXX_FORCE_NEW=1
+export G_SLICE=always-malloc
+
+exec valgrind --num-callers=50 \
+           --leak-check=yes \
+           --leak-resolution=high \
+           --show-reachable=yes \
+           "$@" 2>&1 1>&3 3>&- |
+sed 's/^==[0-9]*==/==/' >&2 1>&2 3>&-