GUI: try using FFTW for per-chan osc wave center

not reliable yet

extern/fftw/api/malloc.c

@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2003, 2007-14 Matteo Frigo
+ * Copyright (c) 2003, 2007-14 Massachusetts Institute of Technology
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+ *
+ */
+
+#include "api/api.h"
+
+
+void *X(malloc)(size_t n)
+{
+     return X(kernel_malloc)(n);
+}
+
+void X(free)(void *p)
+{
+     X(kernel_free)(p);
+}
+
+/* The following two routines are mainly for the convenience of
+   the Fortran 2003 API, although C users may find them convienent
+   as well.  The problem is that, although Fortran 2003 has a
+   c_sizeof intrinsic that is equivalent to sizeof, it is broken
+   in some gfortran versions, and in any case is a bit unnatural
+   in a Fortran context.  So we provide routines to allocate real
+   and complex arrays, which are all that are really needed by FFTW. */
+
+R *X(alloc_real)(size_t n)
+{
+     return (R *) X(malloc)(sizeof(R) * n);
+}
+
+C *X(alloc_complex)(size_t n)
+{
+     return (C *) X(malloc)(sizeof(C) * n);
+}