Eltetrado

Use [RNApolis](https://github.com/tzok/rnapolis-py) to extract secondary structure from 3D coordinates. This library is very robust and allows ElTetrado to find tetrads faster and better.

**Full Changelog**: https://github.com/tzok/eltetrado/compare/1.4.7...1.5.0

**Full Changelog**: https://github.com/tzok/eltetrado/compare/1.4.3...1.4.4

**Full Changelog**: https://github.com/tzok/eltetrado/compare/1.4.0...1.4.1

- Use an external base-pair annotator, no longer rely on commercial software
- Show loop progression in addition to Webba da Silva's classification
- Make 3D structure parsing more sophisticated and robust
- Lots of improvements and bugfixes

**Full Changelog**: https://github.com/tzok/eltetrado/compare/1.3.0...1.4.0

**Full Changelog**: https://github.com/tzok/eltetrado/compare/1.3.3...1.3.4

**Full Changelog**: https://github.com/tzok/eltetrado/compare/1.3.0...1.3.2