eCAL internal and python packaging produce different version numbers

[KerstinKeller]

Problem Description

Currently, eCAL internally calculates a version number using git describe, and python packaging also computes a version number for it.
However, these version numbers don't match under certain conditions. However they are compared in Python unit tests, which leads to failing unit tests.

We have to adapt one or the other to achieve matching version numbers.
(only true for commits which are not a clean tag).

How to reproduce

Run eCAL Python unittests e.g. on support/v6.1

Unit test failure output

         assert version.major == ecal_package_version.major
          assert version.minor == ecal_package_version.minor
  >       assert version.patch == ecal_package_version.micro
  E       AssertionError: assert 0 == 1
  E        +  where 0 = <Version major=6, minor=1, patch=0>.patch
  E        +  and   1 = <Version('6.1.1.dev14+g9217d1f06')>.micro