Set accept403=false for doesBucketExist
listByPrefix should only list directory-contents on local FS
Delete streamchannelArchvive thumbnails recursively
Merge pull request #1198 from njam/issue-1198

S3 _ensureBucket() auth message
Merge pull request #1200 from njam/issue-1200

Delete video streamchannel thumbnails recursively
Merge branch 'master' of github.com:cargomedia/CM into issue-1195
Renamed DbReadOnly to DbRead
Added service DbMaintenance
Passed CM_Db_Client instance to CM_Db_Db::exec()

- Removed parameter passed to getClient($readOnly)
- Added helper methods getClientRead() and getClientMaintenance()
- Client instances not referenced on CM_Db_Db any more, but on the CM_ServiceManager instance
- Removed _getReadOnlyAvailable() and flag $config->serversReadEnabled for simplicity
- Simplified service configuration
- Adjusted usages