New Features

tabmode now is toggle. If it detected workspace is already in tabbed mode, then it remove tabs.
New sub-command print-tree. Produce a snapshot of the tree data representation of a workspace layout (or all workspaces).
All sub-commands (when it makes sense) now accept an optional workspace number. In order to specify the execution for a particular workspace.
New sub-commands save-layout and restore-layout. They respectively store and load a workspace's layout.
- The output can be in JSON or binary (for maximum efficiency)
tabmode now is integrated with save/restore layout. When switching back from tab-mode it is possible to restore the previous layout.

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