Added generate_helix and integrated into Edge Class

[shanilpanara]

Still need to clean up generate_helix code and add docstrings.

But now an edge creates its own system when initialised.

Can now close #5

@debeshmandal I'm sure there will be clashes with your updates to the code, if its ok with you, I want to work through these tomorrow so I get some experience resolving conflicts.

[debeshmandal]

I like it - some points::

• Each Edge should have a function (not property since there are many parameters that we can change e.g. sequence) called strand() - which means the following:
  • the Edge shouldn't create a System
  • for the purposes of keeping the implementation I think that the nucleotides property of Edge should be removed - an Edge should be purely geometrical (not related to DNA) but with a sole 'gateway' to a DNA system by using the strand() function - this is a more broad point that is subjective and up for discussion

[debeshmandal]

The generate_helix function should be in the strand.py file (to help tidy things up)

[shanilpanara]

Main things from today:

• sorted out passing a sequence when calling generateHelix, this took a lot longer than it needed to!

• added testing alongside this for both the generateHelix() function and Edge.strand() method

  Each Edge should have a function (not property since...

• Also worked on this, now we can pass any other parameters (which are passed into the generateHelix function) to the method in the Edge class called strand()

• We can then access this Strand object stored within the Edge object as EdgeObject.helix

@debeshmandal

[debeshmandal]

@shanilpanara sounds good - have you pushed through everything yet? when you have, feel free to merge and then I will make some edits if necessary. After a quick glance, it looks great and any edits I make will be mostly cosmetic 👍

[shanilpanara]

Everything is pushed that I have, will merge now @debeshmandal