Deprecating stuff that is about to be removed.

See
https://github.com/sonatype/nexus-oss/pull/222
deprecate OperationModel and related
Added proper javadoc tag
Deprecated
Deprecated complete "instrumented" pool

Is unused.
Unused ctor
Using ComponentSupport, optimize import
Deprecated, as is unused.
Explained where we go.

As this exception was already deprecated.
Deprecated, as never was implemented. To be removed
Using component support
Deprecated, pending removal.

As all of the EventInspectors are about to be migrated to EventSubscriber
Deprecated. To be removed once Nexus 1.x upgrade is unsupported.
Deprecated as iface is doomed too.
Deprecated, to be removed once Nexus 1.x upgrade is unsupported.
Deprecated smart wastebasket.
Deprecated Maven1 support.
Deprecated resource store utils.

Only one method used in only one place, so moved it in.
Updated packaging mapper.
Removed MetadataManager inferface, as this made a mess here