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It's possible to pass raybundle options now.
This way angles or different starting positions
of the raybundle can be configured.

Allows for plotting of cylinder raytracing without correction.

This takes lens cut-off height into account for plotting. Per default
cut-off happens at a radius of 57 mm (see configuration:
aperture_height = 114).

The optimization also does only optimize the correctional lense within
45 mm radius inside the cylinder cavity, in order to smooth the tilt
inside the cylinder and behind the setup more towards the optical
center axis.

The routine keeps track of already achieved solutions, rather than
comparing the current merit value to a minimal achieved merit.

This accomplishes to display a range of local minimal solutions
within the optimization boundaries.

Due to max_aperture being to low, not the full height of the
theoretically approaching raybundle got simulated.

The center thickness has to be inverted, in case the surfaces get
swapped.

In case no target merit is defined, the function runs the optimization
again and saves the result, if a lower merit value is achieved.  If
no lower merit gets achieved, a counter stops optimization after a
set number of invain optimization runs.

Bug: Last setup is saved twice.

From now on an argument fixed_target can be passed to the function
in order to repeat the optimization and only save results, if
the specified merit-value fixed_target is achieved.

Is only added for documentary reasons. Has to be patched, in order
to work again.

Functions setup_optimization and do_system_optimization get introduced
to contribute to this goal.

Get a configuration for an optical system based on an optimized solution.

Also tweak modifiy_initial_config_for_optimization, i.e. erase
side-effects and make it operable.

Also add function optimize for convenient calling of standard
optimization.

Also added full cylinder surface configurations to configurations.py .

A rough analytical approximation to the plano-convex correction setup.

Quickly build the full simulation setup from results of the
half-cylinder optimization.