Add more INBO R packages to overview article

[florisvdh]

This is about page: https://inbo.github.io/tutorials/articles/inbo_software/

The packages can be enlisted in that article when they're ready - and then you can tick it here:

• abvanalysis and dependencies (such as n2kanalysis) -> @ThierryO
• dhcurve -> @ElsLommelen
• inbobostypologie -> @pietervsd
• protocolhelper -> @hansvancalster

[florisvdh]

Edit: added the protocolhelper package in the task list.

[pietervsd]

inbobostypolgie has no place here, it is a specific project, not for general use, as this topic is intended for