Fixed: code formatting
Added: new DDS building targets: wn_bin and wn_bin_upload
Those targets are used to create DDS worker packages and upload them on the DDS binary repository.
dds-user-defaults learned new options:
	- - wrkpkg: Show the full path of the worker package. The path must be evaluated before use.
	- - wrkscript: Show the full path of the worker script. The path must be evaluated before use.
	- - rms-sandbox-dir: Show the full path of the RMS sandbox directory. It returns server.sandbox_dir if it is not empty, otherwise server.work_dir is returned. The path must be evaluated before use.
fixed usage of User defaults as a singleton
dds-user-defaults: learned new option:
	- - userenvscript: Show the full path of user's environment script for workers (if present). The path must be evaluated before use.
dds-user-defaults: learned new option:
	- - server-info-file: Show the full path of the DDS server info file. The path must be evaluated before use.
The dds-prep-worker utility has been added to the project. The utility is used to prepare DDS worker package, which can be submitted on RMS.
Fixed: code formatting
Fix idle_time to 1800 sec. Add initial version of Binary_Attachment command.