Remove initializationPrior and rename objectivePrior

[sebapersson]

Following the discussions at the editor meetings, this PR removes initializationPrior from the parameter table, and renames objectivePriorType to prior.

[dweindl]

Thanks, looks good to me.

[dilpath]

👍

[dweindl]

Please add a brief summary to the "Changes" section.

Something like:

• initializationPrior{Type,Parameters} columns were removed from the parameters table because this was beyond the definition of the parameter estimation problem, and was a source of confusion
• objectivePriorType and objectivePriorParameters in the parameters table have been renamed to prior and priorParameters, respectively.

[sebapersson]

Please add a brief summary to the "Changes" section.

Thanks for noticing. I have now added a short summary in the changes section. If it looks good, feel free to merge, then I will update #595

[dweindl]

then I will update #595

Go!