Refs: #175

Refs #175

For handling hydroPSO exception on V02

Refs #175

- depnedencies need to be installed too ('hydroGOF' and 'hydroTSM')
Refs: #

- remove the explanations from the vignette '2.1_param_optim' about the installation of the package from the CRAN archives
- add the package in the 'Suggests' list of the DESCRIPTION file
Refs: #175

Refs: #182, 730ac944

- add add installation information in 'V02.1_param_optim' vignette

- avoid Error because the package is removed from the CRAN
- silenced the package in the 'param_optim' vignette
Refs: #172

- vignettes :
  - param_optim
  - param_mcmc
- RunModel outputs: return only Qsim
Reviewed-by: @francois.bourgin
Refs #101

docs(vignette): fix the starting points used for the multi-start approach in the param_optim vignette
- replace real space by transformed space
Refs #101

Refs #61

Refs #55

- Add purl=FALSE to the chunk refering to method hydroPSO which is failing du to a bug in current version of hydroPSO
- Add test comparing synthetic results on other methods
- Add comment on library hydroPSO concerning dependency issue on R 3.5

Fix #52