Fixes to astigmatic lens component. Now has lens** and lens*** for astigmatic focal and power definitions

some code cleanup to remove compiler warning, fixing a bug with component names function get_comp_name()

This drastically reduces rounding errors for certain step sizes.

fixing bug: rebuild flag on m or bs would be overwritten by put x2xaxis etc, now changed it to an or-equal assignment

This fixes the randomly occuring "PipeError"s that are seen from time to
time.

small changes to plotting: change default gnuplot terminal to QT for OSX and unknown systems, python plotting now compatible with new matplotlib, needs some testing on older versions

Switching off signal calculation when doing locks, speeds up some simulations significantly as the signal matrix output is never used for DC lockin

Adding in code to enable beamsplitters to do radius of curvature fsig modulations. Still a work in progress. I also have made the functions get_node_q_to and get_node_q_from as a convenience function for more visibly getting the q in a particular direction at a node, relative to some component.

Adding in code to enable beamsplitters to do radius of curvature fsig modulations. Still a work in progress. I also have made the functions get_node_q_to and get_node_q_from as a convenience function for more visibly getting the q in a particular direction at a node, relative to some component.