The XML thing is supposed to be used for auto-completion, of course. The
current search implementation is very, very stupid and simple: Just a
prefix match on the man name, and simple detection of section stuff. I
suppose it'll suffice for now.
This fixes the indexing of some packages. The most common error is to
have a doubly-gzip-compressed file with only one '.gz' extension, which
would previously not be detected.
