Incorporate Circular DNA

[rty10]

Circular DNA currently works by taking reference frame of structure, copying the first frame to the end, and then in optimization ensure use of "--hold-last-bp".
Circular DNA options should be in place to automatically generate this addition in the code and add stipulation to emDNA_DNAElectrostaticsParams / BpCollectionElectrostaticEnergy files to prevent possibility of two charges occupying the same space.

[rty10]

Ran a test optimization of structure X with no errors without AND with new Electrostatics code:
$ emDNA-cli --x3DNA-bp-input=X.dat --DNA-seqdep-model=IdealDNA --hold-last-bp --energy-progress --output-name=X
$ emDNA-cli --x3DNA-bp-input=X.dat --DNA-seqdep-model=IdealDNA --dh-electrostatics --hold-last-bp --energy-progress --output-name=X

Took structure X, copied the first frame as a new last frame to produce a circular structure (common practice). Ran a test optimization with a circular form of DNA, where the first and last base pair are the same in space.
$ emDNA-cli --x3DNA-bp-input=X.dat --DNA-seqdep-model=IdealDNA --hold-last-bp --energy-progress --output-name=X
The following error was given:
'terminate called after throwing an instance of 'std::logic_error'
what(): basic_string::_M_construct null not valid
Aborted'

Same error for when you try --dh-electrostatics

Doing circular optimizations in the past where the first and last base pair frames were the same never produced this error.