load.data.multistart: Load data for model fitting
In a-henderson91/vectorbornefit: MCMC fit SEIR model of vetor borne transmission

This function loads surveillance cases, serology results and initial parameter values for vector-borne model fitting

1 2	load.data.multistart(add.nulls = 0, startdate, Virus, cases.file.name, serology.file.name, init.values.file.name)

`add.nulls`	Number of time series values to add to end (default is 0)
`startdate`	Start month of time series
`Virus`	Name of virus for serology results. e.g. 'Zika'
`cases.file.name`	Name of csv file with surveillance data
`serology.file.name`	Name of csv file with serological data
`init.values.file.name`	Name of csv file with initial parameter values