Allow default values for individual options to be passed to read_config_section. The default value can now be passed as a third item in a tuple used in the section description passed to read_config_section. The predefined option descriptions have been updated to use this new mechanism and the global defaults variable is not needed anymore. Also, indivdual PackageTrack classes can now use this mechanism to specify defaults for their additional configuration options.

[global]
server.socketPort = 9090
server.threadPool = 10
server.environment = "production"