Remove some unused python wrappings that are marked with FIXME for documentation
(#426)
Add ability to expand bracket with a hard limit
(#426)
Allow tuples in addition to pairs for LRUCache keys
(#426)
Add explicit splits for integrals that use J0 roots.
(#343)

Conflicts:
	src/SBSersic.cpp
Go back to j0,j1.  They are faster than cyl_bessel_j.
(#426)
Big revamp of SersicInfo and SersicImpl classes #426 to use r0 as the
basic dimension rather than re among other things.  Also break up the
functionality into more discrete units.
Have SBAdd inherit gsparams from first item if none is given.  (Oversight from previous edits.)
(#426)