Simple search should remove short words

[jesusbagpuss]

Indexing doesn't include words less than $freetext_min_word_size.
If these are not removed from the (non-Xapian) simple search, no results are found for searches than contain short words e.g. 'cake or death' would not find something called 'cake or death', whereas 'cake death' would.
This should make the simple search match the indexing pattern.

[jesusbagpuss]

Not sure if the above fix would break anything else - but it seems to be a longstanding problem:

3.3.12:
With short words - broken:
http://eprints.nuim.ie/cgi/search/simple?q=motor+imagery+in+learning+a+complex+motor+task
Without short words - OK:
http://eprints.nuim.ie/cgi/search/simple?q=motor+imagery+learning+complex+motor+task

3.3.10:
With short words - broken:
http://eprints.whiterose.ac.uk/cgi/search/simple?full=Improving+insight+in+medical+volume
http://eprints.whiterose.ac.uk/cgi/search/simple?full=Improving+insight+medical+volume

3.3.8:
Short words - broken:
http://nectar.northampton.ac.uk/cgi/search/simple?q=spin+on+enterprise
Without - OK
http://nectar.northampton.ac.uk/cgi/search/simple?q=spin+enterprise

[jesusbagpuss]

Don't merge this quite yet - I think it should really be doing something more like:
my( $goodwords, $badwords ) =
$session->get_repository->call(
"extract_words" ,
$session,
$value );
[see: perl_lib/EPrints/MetaField/Text.pm]