Deprecate get_config() in favor of add_config()

 - New routine default() creates a CrawlConfig with basic default values
 - New method sum_dict() adds the contents of a dictionary to the current
   config object
 - Use add_config() to set up sqlite tests so they don't depend on an
   external config file
 - Routine get_logcfg() was not used anywhere -- deleted

Version:   2014.1009.70
Change-Id: I9aed2ba62e49d9778a5ce85522ea93108db51858