Version 1.4
-------------

- corrected model 2 formula
- specifying 'xlim' in function 'plot.VFP' lead to an error when calling it from
  within another function, this was corrected by adding 'xlim' as function argument
- in function 'precisionPlot', the label at the mean of the respective normal distribution
  was not correct in case of more than two specified probabilities, this was corrected
- degrees of freedom for non-linear models corrected 
- Function 'fit.vfp' was adapted to cases where a valid set of parameters in the re-parameterized
  space was found but the final gnm-fit in the original parameter-space did not converge. In these
  cases the final set of parameters is returned but no variance-covariance matrix is available. 
  Thus, there will not be any confidence-intervals downstream.
- Adaption in the calculation of confidence intervals. These are now always calculated on the vc scale
  and then eventually transformed to the sd or cv scale. 



Version 1.3
-----------

- issue was fixed if input data contained variables with default names but user specified
  different variables, this had no effect because the variables with default names were used
  for the fitting
- condition handler was updated indicating an error if no result is returned by
  package gnm
- multiple issues were reported for model three which did not return a valid result,
  start value procedure for this model was improved 

Version 1.2
-----------

- a package-vignette was integrated 
- function 'precisionPlot' was added visualizing the relationship between
  C5 and C95 concentrations, (im)precision and one or two cutoffs

Version 1.1
-----------

- fixed issue with 'alpha' not having any effect when being set different from the default in function 'plot.VFP'
- added function 'deriveCx' for derivation of sample-concentration at which a pre-defined proportion of repeated
  measurements would fall above the cutoff, e.g. C5 or C95

Version 1.0
-----------

- initial version put on CRAN
