Add new e1,e2,log(r) ellipse parameterisation
add EllipseE to tractor namespace; add .re property; adapt great3.py demo code to use it
refactor demo code to optimize a bunch of postage stamps and collect stats
plot histograms of measured galaxy properties
collect galaxy stats on deep fields
Fix indentation bug in galaxy_profiles preventing byte-compilation
Merge pull request #18 from bpartridge/bugfixes/galaxy_profiles_indent

Fix indentation bug in galaxy_profiles preventing byte-compilation
Expose data numbers and electron counts in info dict when loading images