Dependency required by poi-3.16.
Dependency was not provided in YaCy but already defined on previous poi
versions. This only became problematic since upgrade from poi-3.15 to
poi-3.16 (commit dedc6552d3). Indeed in
this new poi release, a poi component used in some YaCy parsers code
paths now explicitely needs a class from the commons-collections4
library : org.apache.poi.hpsf.Section uses now
org.apache.commons.collections4.bidimap.TreeBidiMap.
Impacted YaCy parsers : xlsParser, pptParser, docParser.
Issue detected by the folowing JUnit tests failing :
ParserTest.testpptParsers(), ParserTest.testdocParsers(),
xlsParserTest.testParse()
luccioman