Expose enrg_md_steps option in mrdna and enrgmd scripts and in mrdna.simulate.multiresolution_simulation(); thanks to Elija Feigl for the suggestion

Fix multiple issues related to strand generation, also reduce timestep to 100fs if coarse_local_twist==True

Added box_type=orthogonal and CUDA_DEVICE={gpu} to oxDNA input file; thanks to Elija Feigl for bringing the issue to our attention

Reduced timestep of high resolution simulations from 50 to 40 fs because of instability in some systems

1) Fixed lattice_type setting for cadnano structures, affecting ENM
2) Raise exception for circular segments (sites that loop such as RNA stem loops remain problematic)
3) Made translate and rotate functions return if nothing is selected by filter

Slightly reorganized simulation protocol; added options to mrdna script and simulate.py for using twist in the coarsest step

Automatically write atomic ENM in multiresolution_simulation; fixed error in ENM causing failure for square lattice

Updated imports to be compatible with new package structure; updated paths to resources to use new get_resource_path() function

Moved run_simulate_protocols outside of cadnano_segments since more modular; increased density of coarsest DNA model