install r-devel to ~/r-devel, and add /usr/local/lib/R/site-library to R_LIBS_USER, which contains packages installed from apt-get
add an alias Rd for R-devel
make may fail due to timeout on shippable, leaving library/00LOCK-* behind
hmm, apt-get installed to /usr/lib/R/site-library
install a few more R packages
must use `shopt -s expand_aliases` to enable the aliases
rebuild R-devel only if `svn status -u` shows that update is necessary
move some scripts from YAML to their own files, so I do not need to think about backslashes and quotes in YAML, which is painful
add a comment on the weird sed on Renviron
a detailed explanation of this repo
a script to do R CMD check with both R-release and R-devel
exit on error
update badge url
install the dependencies of this package for R-devel as well

[ci skip]
forget about the ugly hack; just let both R and Rd share library paths ~/R and /usr/lib/R/site-library
just remove the whole library
ignore the OK lines [ci skip]
only update packages for the current stable R
special treatment of xtable
also need to build when the first time the repo was checked out