[Bugs] #1038 UNSP: sugar-base: logger.py: allow numeric values for SUGAR_LOGGER_LEVEL

[SugarLabs Bugs]

#1038: sugar-base: logger.py: allow numeric values for SUGAR_LOGGER_LEVEL
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    Reporter:  sascha_silbe               |          Owner:  tomeu            
        Type:  enhancement                |         Status:  new              
    Priority:  Unspecified by Maintainer  |      Milestone:  0.86             
   Component:  sugar                      |        Version:  Git as of bugdate
    Severity:  Unspecified                |       Keywords:                   
Distribution:  Unspecified                |   Status_field:  New              
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 The new datastore prototype uses a new log level for tracing function
 parameters / return values as it clutters the logs a lot. In order to
 activate this new log level logger.py needs to either list the new level
 or allow numeric values to be used. As the latter is more generic I've
 implemented it.

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Ticket URL: <http://dev.sugarlabs.org/ticket/1038>
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