Additional fields to be implemented in QField

[oolonek]

According to cuurent discssion with Manu and Edouard.

We should have additional field in the current QField app.

• a box for additional pictures (illlimited number)
• a field for the IPEN / accession number of the specimen in a given botanical garden
  (this one should hep to track the genetic origin of a sampled individual)
• a field to track an id number (yet to be defined) for an individual
• a free text field