PR commit for adding support for degree 1 curves
fixed curve pr
small fixes to PR
Merge pull request #582 from sriravic/curve_pr

Adding support for degree-1 curves.
minor code tweaks.
changed the depth aov to use 4 channels since 1-channel aovs are not properly supported yet.
fixed compilation of makefluffy after recent introduction of degree-1 curves.
small code simplifications and cleanups.
More displays work
Merge branch 'master' into est_display_plugins
Prepare for PR