Fix failing test caused by 89b2c54c00.

Actually, the old reference was wrong, since it misparsed IPA short cuts as
spaces. I verified that the re-exported .tex is correct.
Preamble.cpp: fix bug #8723
LaTeXFeatures.cpp: fix bug #8731

- we must assure that the package mhchem is loaded before the package esint
Fix mis-spelling of "contirbutor".
Fix toggling of 'misc' font options (bug #8764)
Merge branch 'master' of git://git.lyx.org/lyx

# By Uwe Stöhr (2) and others
# Via Juergen Spitzmueller
* 'master' of git://git.lyx.org/lyx:
  Fix toggling of 'misc' font options (bug #8764)
  Fix mis-spelling of "contirbutor".
  LaTeXFeatures.cpp: fix bug #8731
  Preamble.cpp: fix bug #8723
  Fix failing test caused by 89b2c54c00.