Shelving: command-line output format of svn shelves / shelf-list

The shelf listing could do with some design improvement. Currently in trunk it looks like:

$ svn shelves
bar                            version 1, 3 minutes ago, 1 path changed
 Log message

$ svn shelves -q
bar

in svn 1.10.0 it was:

$ svn shelves
foo                                   3 mins old        235 bytes    1 paths changed
 Log message
 a |    1 +
 1 file changed, 1 insertion(+)

The idea in the initial version was to display plenty of details, so the user can find what they are looking for even if their shelves don't have good names or log messages.

For a better design I think we should:

• make the (default) output rather more compact;
• make it more consistent with existing comparable Svn features such as "svn log", although certainly there should be some differences.