Requires Qt4 or higher.

Requires further, from the Ger* libraries:
  - gerqutils 1.1.1 or higher.
  - gerphys 1.3.1 or higher.
Source distributions may be downloaded from http://www.markus.gerwinski.de.

Tested on these systems:
  - Ubuntu Linux 14.04.4 LTS with Qt 4.8.6
  - Ubunto Linux 16.04.1 LTS with Qt 5.5.1

