activate the "install.packages" function, only if the package is not already installed, then load that package
| 1 2 | 
| packages | A vector of packages to be checked or installed. Defaults to a list of my favourite packages, all worth having. | 
| repos | A character string, linking to the repository to be utilised if packages need installing. | 
| quietly | TRUE or FALSE, should we suppress helper outputs? | 
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