Draft Linear1Pass first release
This is the first release of the Linear 1 Pass focus algorithm. It should contain the following:
- changes to focus.cpp, focus.h, focus.ui, focushfrvplot.cpp and focushfrvplot.h to integrate L1P into the existing code base
- additions to manager.cpp to integrate L1P into the existing code base. This needs to be rebased as I see there are some changes since I took the code I worked on. I'll figure out how to deal with this.
- curvefit.cpp and curvefit.h which is new and contains the solver code.
- focusalgorithmslinear1pass.cpp and focusalgorithmslinear1pass.h which is new and contain the code to drive the focuser when L1P is selected.