Fixed attempt to remove GT_AnnoEle range records twice.

GT_AnnoEle were being removed by bin_remove_item, and then again by
anno_ele_destroy.  The latter couldn't find them, so returned an error code
which caused delete_tag_single_contig to stop after only removing one tag.
Fixed by declaring anno_ele_destroy obsolete and not calling it any more.


git-svn-id: https://staden.svn.sourceforge.net/svnroot/staden/staden/trunk@3152 ba6f2710-ca9f-427c-89d3-5bf716dbc8e1