oxDNA export forward vector fix #183
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in the oxDNA export function, the file format requires several vectors (r, b, and n as per https://dna.physics.ox.ac.uk/index.php/Documentation) to describe each nucleotides position and orientation in space. Nucleotides belonging to the forward strand of a helix are expected to have opposite oriented n vectors from those belonging to backward strands.
Incorrect signs don't result in significant visual differences in the generated oxDNA files when visualized; however they do cause the forces to be calculated incorrectly when the files are simulated in oxDNA causing helices to melt.
This change fixes those sign errors.