+2007-10-31
+ * fixed bug in new "can dig" feature (see below) so that an unsuccessful
+ try to push something (due to push delay) does not cause a dig action
+
+2007-10-29
+ * fixed bug with reference elements used as trigger elements on custom
+ element change pages not being recognized
+ * fixed bug with reference elements not being removed from the playfield
+ * added engine functionality that allows custom elements that "can dig"
+ other elements not only to do so when moving by themselves, but also
+ when being pushed by the player (therefore adding the functionality to
+ push one element over another element, replacing it with the new one)
+