Reorganize to hold camera and filter and data butler mapper implementations.
Start work on per-observatory mappers.
Add initial cut at package files.
Initial check in of Cfht focal plane description.
Added basic unit test, and camera generation script.
updated name and serial definitions.
STA -> Megacam
Add initial guesses at MegaCam filter set.
Add policy dictionary for new CFHT mapper.
lambdaEffs need to be doubles.
Fully implement CFHT mapper, including tools to build registries.  Add SConstruct for packaging, fix EUPS table.
Allow registry to be specified in constructor.
Moved genCalibRegistry to bin.
No amps after CcdAssembly.
Use updated cameraGeomUtils.getGeomPolicy() to get camera defaults.
Fix typo.  Add visitim mapper.
Add psf dataset type.  Only retrieve field and filter from input registry if needed.  Use filter to look up calibration run id for datasets that need it.
Deal with missing calibrations (e.g. fringes for filters other than i, i2, and z).
Allow root, calibRoot, and registries to be relative to location map paths (input, output, update, work, etc.).
Small change to reflect readout locations of CFHT amps