If targz = NULL, all packages found in bootstrap/software are
installed, as long as they have filenames of the form
package_sha.tar.gz containing a 7-character SHA reference code.
The default behavior of taf.install is to install packages in
alphabetical order. When the installation order matters because of
dependencies, the user can specify a vector of package filenames to install.
# NOT RUN {# Install one packagetaf.install("bootstrap/software/FLAssess_f1e5acb.tar.gz")
# Install all packages found in bootstrap/softwaretaf.install()
# }# NOT RUN {# }