Proposal of 'financial groups' feature

[Wahazar]

It would be nice to have 'finance groups' option, new window reachable via button in finance window,
which would allow to group existing vehicle groups and show their total year and last year income (similar, like 'vehicle group info' patch do).

Currently you can group same type of vehicles, and see if they have negative/positive income, or have detailed info with use of 'vehicle group info' patch.
But there is no way of grouping together for example ships and trains, to see if *total* income is positive or not (and how high is).

Unlike normal groups, which are used also for autoreplace function, 'finance groups' would be used for informational purposes only.
Instead of grouping vehicles, they should group existing groups of vehicles, including 'ungrouped' and 'all' pseudo-groups.

[jvassie]

Moved this to the OpenTTD Suggestions section.