Add in a capacity widget and set up the callbacks to update it.

experimental/ecdb/trunk/src/ecdb_common.h

@@ -92,6 +92,7 @@ struct _Ecdb_Source
    const char *dst;
    unsigned char dir:1;
    unsigned int num_children;
+   long long size;           //Sizeof itself and children
    Ecdb_Source **children;
    Ecdb_Source *parent;
    IsoNode *node;