…to-export-cadnano-with-no-whitespace

228 option to export cadnano with no whitespace

…r` and used them in unit tests

…letions` and `StrandBuilder.with_insertions`

…th_relative_offset_on_empty_error

…oopouts-on-the-end-of-a-strand

Closes #2; support Extensions on the end of a Strand

…hould check for existing crossovers

…add_full_crossover-and-design-add_half_crossover-should-check-for-existing-crossovers

fixes #231: Design.add_full_crossover and Design.add_half_crossover should check for existing crossovers

…ded Address information to error message when calling `Design.add_full_crossover`

… to use loops to specify a long strand with its methods

…StrandBuilder`

Set Position3D as frozen

…`display_length` for `Extension`

… git repo

…ly and loopout normal vectors weren't being normalized

…t-loopout-normalization

fixed issue where get_normal_vector_to was being calculated incorrect…