Feature/135 apply functions from datatools

[jan-abel-inwt]

Could you please merge the changes from main into this branch? Everything else looks ok. +1 https://github.com/Pandora-IsoMemo/iso-app/network

Done.

[arunge]

@jan-abel-inwt As just discussed, forget the above, just add the lines

if (Sys.getenv("API_BASE_URL") != "") {
    apiBaseURL <- Sys.getenv("API_BASE_URL")
  } else {
    apiBaseURL <- Sys.getenv("API_BASE_URL_DEFAULT")
}

instead of

apiBaseURL <- Sys.getenv("API_BASE_URL")

to the DataTools function! :slightly_smiling_face:

Then the error should be fixed.