Removed dependence on BioPython package

made my own library ‘seqfun’ which contains function
‘reverseComplement’. seqfun.py can be modified with other
sequence-related functions.
Actually removed dependence on Bio.Seq.

Before I didn’t change helix.py and junction.py. Those libraries didn’t
actually call Bio.Seq, but they tried to import it.
intermediate work on changing the threading procedure
changed workflow in threading

Changed ‘threadTogether’ function so that it is called iteratively,
progressively adding sequences to a central region, rather than taking
each sequence and ordering it in a particular order. This is moving
towards being able to have multiple junctions.
Merge branch 'changeThreading'
printed hello

Matt is cool.
deleted two lines
Merge branch 'master' of https://github.com/sjkdenny/JunctionLibrary
can have no junction

functionality in junction call to have no junction: spits out an empty
string for each side
added functionality for no junction
Added global parameters
added library
This module now called from other wrappers
added library
Added to get all three by three sequences
allow 'centerLocation' function
added parameters
order of ops: by function instead of by junction
included new receptors and loops
many changes