Initial release with example application

Initial release includes the source code for generating widefield and
super-resolution images from simulated microtubules with different
properties such as contour length, persistence length, diameter, and
labeling density. The generated images include optional signal noise
and background noise for widefield images and localisation errors for
super-resolution images. The positions of the fluorophores their
localisation accuracy and segments of the microtubules are saved for
purpose of re-use or ground truth.

The example application (see mt_generate_profiles.m in source
directory) generates a small dataset of straight microtubules with
different diameter and labeling density to analyse expected profile
plots.