Status command

"The dep-status command display status of root package requirements:
what packages are missed, changed or outdated; what package versions are installed"

Notes:
* For now this command does not have error statuses.
* I think we can change curernt "status" command for this one because it is more relative for this name, and rename current one with more logical name like "changes", "local-changes", "modify-status", etc.

Any comments and additions are welcome