Fixed a bug, Added Accession_NO field, Changed some tt layout, Removed get_xx_obsolete_list subroutine

Fixed a bug: ‘Customise strain list’ now shows correctly
Added Accession_NO field: to both ‘Plasmid’ and ‘Strain’ databases
Changed some tt layout: show strain/plasmid.tt
Removed get_xx_obsolete_list subroutine: merged them to get_xx_list,
and added $tokens{obsolete} check