fix bug in batcopy (corrected setting of heap free pointer 	(not dependend on free of original bat))
fix bug in batcopy (corrected setting of heap free pointer
	(not dependend on free of original bat))

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb