v0.13.0

Total rewrite of the parameter system. Now a full directed acyclic graph with generality for a variety of constraint types. The new system represents each parameter as a node in a graph, it is possible to link nodes to achieve a variety of goals. The main purposes of such a system are to allow:

• Any two parameters may be given an equality constraint by having one simply point to the other in the graph.
• A spatially varying PSF can be achieved by creating parameters that define the spatial variation and then having the PSF parameters point to them through a function
• SED constraints are possible by similarly having brightness parameters point to some functional form of the SED.
• An astrometry correction for multi-image analysis can be created by adding a shift to the position of all objects in a single image.

A lot of creativity is possible with these constraints. A new tutorial is provided to give the basic ideas. Please contact us if you want to try something new with these capabilities!