Add pickle support for ShapeletFunction, MultiShapeletFunction
Add example code to test timing of shapelet galaxy models.
Fix confusing transpose in HermiteTransformMatrix relative to docs.

Also updated doc math to work with MathJax-supported bold command.
Fix typo in argument name
Add inheritance to GaussHermiteConvolution::Impl

This makes room for specialization for zeroth order, coming soon
Add functions for integer and rational square roots.
Added optimized zeroth-order convolution specialization
Better plots for tractor-based profiles.
More pickled PSFs for model timing example.
Add double-Gaussian to pickled PSFs for use with timeModels
Include true lux/luv plots in tractor plotSuite
Use %shared_ptr to wrap MultiShapeletBasis.
Add size getters to MultiShapeletMatrixBuilder
Add double precision option to timeModels
tests: update following afw API change (#3113)
Merge branch 'tickets/3113': AffineTransform,LinearTransform::makeRotation
Cleanups, flux compuation for tractor analysis code
Merge remote-tracking branch 'LSST/master'
Merge remote-tracking branch 'LSST/u/jbosch/w14'