Added a new field “fileType” to the Lucene index.

The field should contain the file type. By default
the normalized name of the analyzer is used.

For example: “CAnalyzer” becomes “c” and
“SQLAnalyzer” becomes “sql”.
Added new field “type” to the web search form.

The field is a single selection containing file types
with user readable descriptions. It is mapped to the field
“fileType” in Lucene.