3-Month mode commands

`.'

Previous, actual and next month of the current year, e.g.:

gcal .

`. yyyy'

Previous, actual and next month of selected year, e.g.:

gcal . 1992

`..'

Actual quarter of the current year, e.g.:

gcal ..

`.. yyyy'

Actual quarter of selected year, e.g.:

gcal .. 1992

`.+'

Actual and next two months of the current year, e.g.:

gcal .+

`.+ yyyy'

Actual and next two months of selected year, e.g.:

gcal .+ 1992

`.-'

Actual and previous two months of the current year, e.g.:

gcal .-

`.- yyyy'

Actual and previous two months of selected year, e.g.:

gcal .- 1992

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