[ci] exclude benchmark test pipeline from ci but run locally

Closes #69

See merge request !52

   benchmark tests are now run locally

Resolve "ogs6.4.1 - Minor Bugfixes"

Closes #66

See merge request !48

Add support for mesh files in MSH format

Closes #67

See merge request !50

    update namespace
    add and update examples, function descriptions

    class to represent MSH mesh files

Resolve "New element "dvalue" in "media/medium/properties/property""

Closes #65

See merge request !46

Resolve "Fix manual pipeline"

Closes #64

See merge request !44

running ogs as singularity container in the gitlab ci
requires to run the ci-container (docker) with elevated
priviliges. this is accomplished via a manual login.

Resolve "Throw Warning when finding an empty XML tag"

Closes #55

See merge request !43

standardize files references during prj import/export (new MR)

Closes #57, #58, #59, and #62

See merge request !41

    GML, DAT, PY, PRJ includes, VTU files