Moved OracleCatalogue::deleteArchiveFile to RdbmsCatalogue because Oracle, MySQL and PostgreSQL support 'SELECT FOR UPDATE'.  SQLite is the odd one out in that it does not provide support.

Catalogue::PrepareToRetrieveXXXX() methods now throw UserError exceptions if the tapes involved are disabled.  The error message is now clearer: 'No tape files available for archive file with ...

RdbmsCatalogue::getArchiveFileXXXX() methods now retrieve the latest version of a tape copy accurate to the nearest second

Done.

Done.

The catalogue can receive polymorphic items as input for recording.
The strict sequencing of fSeqs is still enforced.
Currently, 2 items types are recorded: files and placehoders.
Files are recorded to the tape catalogue, while place holders are not,
but they are used to enforce the fSeq sequencing.

Done.

Done

Fixed.

RdbmsCatalogue::checkAndGetNextArchiveFileId() now calls getCachedRequesterMountPolicy() and getCachedRequesterGroupMountPolicy()

RdbmsCatalogue::getRequesterGroupMountPolicy() now returns optional<common::dataStructures::MountPolicy>

RdbmsCatalogue::getRequesterGroupMountPolicy() now returns std::unique_ptr<> instead of a raw pointer