Does `Options` DTRT for flag options yet?

[JHopeCollins]

What does this comment mean? Is it still true? If yes, should we open a PETSc issue? If not, can we get rid of this and use PETSc.Options(self.options_prefix) instead?

petsctools/petsctools/options.py

Lines 277 to 283 in f4db79a

	# Now update parameters from options, so that they're
	# available to solver setup (for, e.g., matrix-free).
	# Can't ask for the prefixed guy in the options object,
	# since that does not DTRT for flag options.
	for k, v in self.options_object.getAll().items():
	if k.startswith(self.options_prefix):
	self.parameters[k[len(self.options_prefix):]] = v