Many important changes, read description

getDefaultWeights/ExtraData are now GET instead of POST.
updateParameterValue has changed the way it receives parameters, see swagger documentation, which has been updated.
 (fefo you have been warned)

default extra data model has been changed to allow bigger values.
updateEquationConstants was split into 3 functions, to accomodate each possible parameter type.
an error is now returned if no rows are affected by an update.