use string config instead of writeIO magic

merge ontop of !717 (merged)

requested review from @schaefed

assigned to @palmb

changed the description

added 6 commits

• bc0314e3 - typos
• 95577a22 - typos
• 063ef280 - implemented some feature discussed in VC. make reader private
• 3a3ba2fe - fixed new Exceptions
• dd325b8a - minor change
• 99f7b2c4 - merged base

Compare with previous version

changed target branch from develop to more_input_options

deleted the more_input_options branch. This merge request now targets the develop branch

added 12 commits

• 99f7b2c4...f7670f15 - 11 commits from branch develop
• 65bc3e65 - merged develop

Compare with previous version

approved this merge request

enabled an automatic merge when the pipeline for 65bc3e65 succeeds

aborted the automatic merge because source branch was updated

added 1 commit

• 92eb7bb9 - fixed testsuite

Compare with previous version

merged

mentioned in commit fb1c9fa4