Downloads the latest version of the BiocInstaller package, and upgrades all currently installed packages to the latest repositories for this version of R.
To upgrade, use:
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biocLite Installs/updates Bioconductor/CRAN packages.
chooseBioCmirror lets you choose from a list of all
public Bioconductor mirror URLs.
chooseCRANmirror lets you choose from a list of all
public CRAN mirror URLs.
install.packages installs the packages themselves.
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