Merged BazaarSharp branch.
Implemented 'Add Solution to Source Control' command.
Implemented 'Compare' commands in status and history tool windows.
Implemented 'Open file' commands in status and history tool windows.
Implemented context-menu entry to add unknown files to version control.
Improved history tool window. Fixed status tool window.
Removed 'tags' column from history tool window for now.
Added history tree.
Added 'Add Solution/File to Version Control' menu entries.
Merged Banquet branch.