Added boolean and int versions of getParameter() to DocIndexerAbstract.
Renamed DocIndexerTeiP4 to DocIndexerTei and made it parse P5 as well.

The only change to the indexer is that it now accepts both TEI and TEI.2
as root element. This indexer is basic enough that no other changes are
needed.
Took into account TEI files with multiple TEI documents.

The TEI or TEI.2 element can also occur as a child element of teiCorpus.
This is handled correctly now.
Improved special handling of title and author in TEI indexer.

Combining levels 1 & 2 of author and title only happens if these fields
were specified now, so we don't store empty values for other documents.
Made CorpusQL parser deal correctly with empty strings.
Removed .codepro directory from source control