Add new port deskutils/epoch:

Epoch is small and handy timeline application. The time scale is
accurate in the range from 1sec to several million years. Events
can be positioned absolutely or relatively linked to another era.

WWW: http://code.google.com/p/gepoch/

PR: based on ports/148767
Submitted by: Gvozdikov Veniamin <g.veniamin at googlemail.com>