Search should be case insensitive

XWiki does case sensitive search, e.g. if I search for "available", available will be found, but not "Available." It seems that this does not happen with buil-in storage, just with database.

Solution: change search page Main.WebSearch so it ignore case:

from:

1. 1. -----------------------------------------------------------
   2. Search in page content
   3. -----------------------------------------------------------
      #set ($sql = "where $webClause doc.content like '%$!text%' order by doc.date desc")

to:

1. 1. -----------------------------------------------------------
   2. Search in page content
   3. -----------------------------------------------------------
      #set ($sql = "where $webClause upper(doc.content) like upper('%$!text%') order by doc.date desc")