JPM: just moved performance 'test' out of the way
JPM: potential optimization in SeqStoreSortingCollector (test/probe/profile better at some other time)
JPM: new Java class to be used in SequentialStorage._Index
JPM: SequentialStorage now works with SeqStorageIndex.java
JPM: cleaned up sequentialstorage.py
JPM: further optimization of itervalues with Collector (before starting on another approach that doesn't require slow NumericRangeQuery)
TS/JPM: added SequentialStorageTest.testKeyErrorForUnknownKey
TS/JPM: work in progress: delegating itervalues() to Java with termsEnum
JPM/TS: added test using _Index.itervalues() after a delete.
JPM/TS: fixed more code, most tests work, work in progress.
JPM/TS: simplified SeqStorageIndex.java, added NumericUtils.filterPrefixCodedLongs to wrap termsEnum.