Module to design siRNAs

[tjakobi]

A module to design siRNA sequences for use with circlular RNA was suggest on the SPP1738 conference and seems like a natural extension of circtools' functionality.

[tjakobi]

Note: take care of off-target effects, siRNA should be unique

[CDieterich]

https://academic.oup.com/nar/article-lookup/doi/10.1093/nar/gkw1325

[CDieterich]

I would like to push this to Version 0.3.0

Do you agree ?

[tjakobi]

Yes, we agreed to push this module, just forgot to update the issue correspondingly.

[tjakobi]

Now under review in #81