…-length-of-modification-connector-

fixes #212: change length of modification "connector"

…p_cadnano_export

stap_loop -> stapLoop in cadnano export

…2_format_same_helix_xsover

Cadnano2 import of crossover to same helix

…e public (though still undocumented)

…nable a subset of strands to be put in the plate map, and to enable the table to contain another marker besides the strand name such as an X

…te-plate-map

#210 generate plate map

…rder_issue

Helix order when importing from cadnano

…and`

…-`Design.strand`-to-`Design.draw_strand`

closes #219: change `Design.strand` to `Design.draw_strand`