check both the pidRegistry and the lowLevelStore to see if a pid exists
- add log warning when object exists but is unregistered. DRY in Store
- add legacy store impl of objectExists and datastreamExists
- log sql errors when an object can't be registered
- make use of new methods to avoid unnecessary exceptions
- consistently null vars in DBRegistry
flag normal exits from the SQLRebuilder, and do not start existing FCRepos if the flag is false
- ensure DOManager unit tests run as part of suite; clean up Frowny artifact
[maven-release-plugin] prepare release v3.7.1
[maven-release-plugin] prepare for next development iteration
Merge pull request #17 from fcrepo/3.7.x

3.7.x