Add an option to report a specific week/month/year

[HTOgit]

Hi,

in watson report there are the shortcuts to report the timespan in the current day/week/month/year.

For me it would also be practically to have the option to report e.g. the 49th week of the current year.
Of course, one could achieve this via --from and --to, but a shortcut would be nice.

[jmaupetit]

It would be lovely to also add this feature to the log command.