Remove methods previously deprecated in prior releases

[cicirello]

Summary

Remove all methods deprecated in earlier releases. This includes the following:

• The SequenceSampler.sampleReservoir methods, which are now replaced by the SequenceReservoirSampler class.
• The SequenceSampler.samplePool methods, which are now replaced by the SequencePoolSampler class.
• The SequenceSampler.sampleInsertion methods, which are now replaced by the SequenceInsertionSampler class.