Until now, there was no warning when the 'maneage' branch didn't exist in
the Git history. This can happen when you forget to push the 'maneage'
branch to a remote for your project, and you later clone your project from
that remote (for example on another computer). We use the 'maneage' branch
to report the latest commit hash and date in the final paper (which can
greatly help future readers). Since we check the 'maneage' branch on every
run of './project make' (in 'initialize.mk') this would result in a printed
statement like this:

  fatal: Not a valid object name maneage

Also until now, the description of what to do when TeXLive wasn't installed
properly wasn't complete: it didn't mention that it is necessary to delete
the TeXLive target files. This could confuse users (they would re-run
'./project configure -e', but with no effect).

With this commit, for the 'maneage' branch issue a complete warning will be
printed. Telling the user what to do to get the 'maneage' branch (and thus
fix this warning). Also, the LaTeX macros that go in the paper are now red
when the 'maneage' branch doesn't exist, telling the user to see the
printed warning (thus encouraging the user to get the branch). For the
TeXLive issue, the necessary commands to run are now also printed in the
warning.