[main] set correct default loglevel when running as tex (seriously, dtx is an abomination)
[log] fix newline handling of the last status message when imitating texio.*()

Issue reported by /u/eg9 on

    https://github.com/lualatex/luaotfload/issues/164#issuecomment-31551430
[fontloader] sync with Context as of 2014-01-06