Checkin new version of DM-1466 on top of master.  Includes Russell's review.
DM-1466 changes for new C++ design, Flux algorithms
Changes for final code review of DM-1466
DM-1467 changes for ApertureFlux on new C++ design.
Remove typename from code which was formerly templated but isn't any longer.
Add Doxygen for Algorithm base classes.
Update package Doxygen to reflect new C++ Algorithm interface.
Merge branch 'u/jbosch/DM-1511'
Changes for review of DM-1467
Merge branch 'u/pgee/DM-1466a'
Merge branch 'master' of git.lsstcorp.org:LSST/DMS/meas_base
Merge branch 'master' into u/pgee/DM-1467b
Merge branch 'u/pgee/DM-1467b'
Merge branch 'master' into u/pgee/DM-1463
DM-1468  Remove the old Inputs,Results,ResultMapper mechanism
Merge remote-tracking branch 'origin/u/pgee/DM-1468' into u/pgee/DM-1463