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Closes #7168.

TicketQuery: refactor `expand_macro` to clean-up its code layout after recent changes

TicketQuery: take care of fine-grained TICKET_VIEW permission on tickets, for the formats other than ''table'' which already does it.

Closes #7105.

TicketQuery: ''format=count'' now re-uses some of the Query code to directly perform the count at the sql level (from #216).

This is much cheaper but has the disadvantage of by-passing the fine-grained permission checks.

Note however that the same can be said for #216, and there, it's not only the count but also the whole paging logic (use of `LIMIT` and `OFFSET`) that doesn't take the fine-grained permissions into account. So the problem has to be fixed there, if possible.

Note that the only adverse effect will be to show ticket counts higher than the number of tickets actually shown to the user.

TicketQuery: for ''format=table'' the query was executed needlessly twice...

Update documentation of the TicketQuery macro (''max'' and ''row'' parameters)

Fix the reversal of forbidden ticket changes, as hinted by ebray in #7169.

Follow-up to r6899, need to reverse direction of sorting for `previous_rev`

Adds fine-grained permission checks in a few additional places.

Patch by ebray, closes #7169.

Fixed copyright year.