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

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

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

Added CatalogueRetryWrapper.hpp

This reverts commit fc001693.

The CI was incorrectly failing.  There was nothing wrong with
the original commit that made the Catalogue class a pure
interface.

This reverts commit abe44e72.

Moved maxTriesToConnect parameter to CatalogueFactory::create().

Refactored retryOnLostConnection() from OracleCatalogue and RdbmsCatalogue

RdbmsCatalogue::prepareToRetrieveFileByDiskFileId() should re-connect to database if connection lost.

RdbmsCatalogue::prepareToRetrieveFile() should re-connect to database if connection lost.

RdbmsCatalogue::noSpaceLeftOnTape() should re-connect to database if connection lost.

RdbmsCatalogue::tapeMountedForRetrieve() should re-connect to database if connection lost.

RdbmsCatalogue::tapeMountedForArchive() should re-connect to database if connection lost.

RdbmsCatalogue::prepareForNewFile() should re-connect to database if connection lost.

RdbmsCatalogue::tapeLabelled() should re-connect to database if connection lost.

RdbmsCatalogue::getTapesForWriting() should re-connect to database if connection lost.

Revert "cta/CTA#186 CTA should cope with idle database connections being dropped by the database server"

This reverts commit 1be86a70.

Refactored RdbmsCatalogue::getTapesForWriting() to be like OracleCatalogue::filesWrittenToTape()