…0.27

Alfonso Ruzafa (1):
      fix install-bin-unix script (#243)

Yihui Xie (28):
      make sure that I'll remember to remove the temporary patch for tlmgr.pl in the future
      $(uname) has been stored in $OSNAME
      if tinytex_root() returns '', there is no need to check further if this root directory is TinyTeX (it definitely isn't)
      need to group the latter two expressions
      fix a problem discovered at rstudio/rticles#288 (comment): when a bibtex error occurs, should not stop immediately but try to parse and install missing packages first
      use xfun::grep_sub() in a few other places
      xfun 0.18 is on CRAN now
      keep (cached) R packages up-to-date
      only update packages that can be possibly updated (e.g. on Linux, don't update /usr/lib/R/library)
      suppress the false alarm on Windows when running `tlmgr path add`:
      resolve action earlier
      don't set R_LIBS_USER if it has been set
      always set R_LIBS_USER on *nix
      close rstudio/tinytex-releases#9: remove %APPDATA\TinyTeX% twice like https://github.com/yihui/tinytex/blob/ce0e9d311830673dbfd2aa945145c54c45020b7f/tools/install-windows.bat#L34 because rd once can't really remove this dir sometimes
      forgot to add path
      delete install-tl and install-tl-windows.bat because users don't need them, and they can confuse users: rstudio/tinytex-releases#9
      patch tlmgr.pl on Windows to avoid the false alarm: http://www.tug.org/svn/texlive/trunk/Master/texmf-dist/scripts/texlive/tlmgr.pl?r1=56562&r2=56561&pathrev=56562
      add ... arguments to r_texmf() and tlmgr_conf()
      add/remove R's texmf tree quietly
      add the `firstaid` package as discovered in https://travis-ci.com/github/yihui/tinytex/jobs/396057138
      one more package: https://travis-ci.com/github/yihui/tinytex/jobs/396082629
      remove the patch introduced in d9ed3c452bbcb526ad682b18a99207d084ce1dbd; the problem seesm to have been fixed upstream
      the bug in `tlmgr info --list --data relocatable` has been fixed, so remove this patch, and add a test so that we will be able to discover this problem if it occurs again
      add a tlmgr_repo function to query or set CTAN repository
      import two more functions from xfun
      wrong logic here: the commit ffce7ab7152cb241d26a299208c8642fda0d204e should be correct; not sure how I screwed it up later
      fix #252: for Linux machines, the arch must be x86_64 for the prebuilt binary version of TinyTeX to be installed; if it is not x86_64, install from source
      CRAN release v0.27