- Update to version 8.1.3

- version 8.1.2 should have prerelease %nil

- Update to version 8.1.2

- Update to version 8.1.2~RC1
- owncloud-server-core symbol obsoleted by owncloud-server package.

- RPM: Merged all *-apps-* packages into owncloud-server
Other attempts to resolve https://github.com/owncloud/core/issues/18043 fail in OBS.
Not an issue with DEB. But merge there too, for consistency and simplicity!
- Cleanup specfile: No more references to optional fhs.
- Cleanup specfile: No more owncloud-server-scl-php54 package.
- Calling occ from its directory according to https://github.com/owncloud/core/issues/17583
- Calling occ with the correct php for CentOS_6_PHP55 and friends.

- Using PreReq on all apps as a potential fix for
https://github.com/owncloud/core/issues/18043
- PreReq must be written all in one line. No \ allowed for continuation lines.