[Bugs] #1090 UNSP: refactor indexing/query parsing, add support for prefixes

[SugarLabs Bugs]

#1090: refactor indexing/query parsing, add support for prefixes
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    Reporter:  sascha_silbe               |          Owner:  tomeu                      
        Type:  enhancement                |         Status:  new                        
    Priority:  Unspecified by Maintainer  |      Milestone:  Unspecified by Release Team
   Component:  sugar-datastore            |        Version:  Git as of bugdate          
    Severity:  Unspecified                |     Resolution:                             
    Keywords:  r?                         |   Distribution:  Unspecified                
Status_field:  New                        |  
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Changes (by sascha_silbe):

  * keywords:  r- => r?


Comment:

 OK, revised my patch. Now subclasses TermGenerator and QueryParser.
 Checked with pylint and pep8.py.

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Ticket URL: <http://dev.sugarlabs.org/ticket/1090#comment:3>
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