HM: Lucene test working with multithreaded flag

Conflicts:
	meresco/lucene/_lucene.py
	meresco/lucene/index.py
	meresco/lucene/indexandtaxonomy.py
	src/org/meresco/lucene/search/DeDupFilterCollector.java
HM: MultiLucene with multithreaded flag
HM: Tested multithreaded and singlethreaded lucene

Conflicts:
	test/lucenetest.py
	test/multilucenetest.py