Fix broken cross-references in documentation

[josephguillaume]

Most of these are to external optional packages, and may need to address #61 first

Missing link or links in documentation object 'BinghamTrib.Rd': 'DonnybrookTemp'

Missing link or links in documentation object 'SalmonBrook.Rd': 'DonnybrookTemp'

Missing link or links in documentation object 'defineFeasibleSet.Rd': 'window.mcmc'

Missing link or links in documentation object 'eigen.plot.Rd': 'rsm'

Missing link or links in documentation object 'evalParsRollapply.Rd': 'ff'

Missing link or links in documentation object 'eventsExplorer.Rd': 'playwith'

Missing link or links in documentation object 'fitByCMAES.Rd': 'cma_es'

Missing link or links in documentation object 'fitByDDS.Rd': 'optim_dds' 'http://www.rforge.net/ppso/'

Missing link or links in documentation object 'fitByNsga2.Rd': 'nsga2'

Missing link or links in documentation object 'lambda.Rd': 'lambda.inverse.sim'

Missing link or links in documentation object 'paretoObjectivesNsga2.Rd': 'nsga2'

Missing link or links in documentation object 'plotPCNSE.Rd': 'ggplot' 'areModelsDominated' 'paretoCatchments'

Missing link or links in documentation object 'runRSM.Rd': 'rsm' 'ccd' 'ccd.pick'

Missing link or links in documentation object 'tellTS.Rd': 'ff'

See section 'Cross-references' in the 'Writing R Extensions' manual.

[josephguillaume]

Errors have been removed in #126, but still need to check whether links need to be added back in. A good starting point is https://github.com/josephguillaume/hydromad/pull/126/commits/2f5ee8605c85b3bafa36b5f7a48982473f040e4a