This is the first release of the core Arcana package separate from the other (now "extension") packages.
I have taken this opportunity to reset the versioning back from v2.0b to prerelease v0.8 (v0.7 referring to the rewritten monolithic package). Arcana v2 will just be a "metapackage" that installs the standard components
* arcana-core
* arcana-dirtree
* arcana-xnat
* arcana-bids
* arcana-spaces