Release with 100 novels encoded at level 1.

Release v0.9.1 is a maintenance release. Release v0.9.0 brought many fixes to corpus composition, many enhancements to the metadata in the teiHeader and to the markup, as well as many improvements to the texts themselves, notably some newly spell-checked texts. Remaining issues should not affect the texts themselves, but rather concern enhancements to typography, markup and metadata. They will be fixed ahead of the next release (v1.0.0).