Removed single:// and ha:// prefixes in backup. They still work, but are not needed, and documentation do not mention them.
Merge pull request #2392 from rickardoberg/backupdeprecation

Removed single:// and ha:// prefixes in backup.
Correct location for javadocs in PDF for 1.9.x only.
Merge pull request #2411 from nawroth/pdf-javadocs

Correct location for javadocs in PDF for 1.9.x only.
Fixed bug that caused RWLock not to free up entries in txLockElementMap.

The mark flag is used to guard against creating multiple RWLocks for the same resource and has nothing to do with TxLockElement entries.

TxLockElement creation and removal is still safe since it is synchronized on the RWLock.
Fixed bug that caused RWLock not to free up entries in txLockElementMap.

The mark flag is used to guard against creating multiple RWLocks for the same resource and has nothing to do with TxLockElement entries.

TxLockElement creation and removal is still safe since it is synchronized on the RWLock.