Function to run noweb file contained in a package. Assume all noweb files of the package are placed flat under the inst directory
runNoweb(nowebFileName, packageName, weaveMethod = "knitr")
Basename of the noweb file, e.g. 'myFile.Rnw'.
Name of the package containing noweb file(s)
Method to apply for weaving. Currently available are 'Sweave' and 'knitr', default to the latter.