rebuild default.nix for linear branch
propagate dependencies on monoid-extras & active
add packdeps script
nix: rebase -povray onto linear, prepare for Mesh changes
add README
mr: add pgf
migrate povray to linear
add packdeps script
nix: Use optparse-applicative-0.11
Merge branch 'linear2'

Conflicts:
	nix/canvas/shell.nix