Add THEN and ENDIF to keywords highlighted in preprocessor-face

git-svn-id: svn://svn.forge.ocamlcore.org/svn/tuareg/trunk@493 a37b5e43-4b7f-4128-9b7a-df1949a3dd69
Refine highlighting types.

git-svn-id: svn://svn.forge.ocamlcore.org/svn/tuareg/trunk@494 a37b5e43-4b7f-4128-9b7a-df1949a3dd69
Be more careful when allowing newlines in regexp.

git-svn-id: svn://svn.forge.ocamlcore.org/svn/tuareg/trunk@495 a37b5e43-4b7f-4128-9b7a-df1949a3dd69
Remove all tabs.

git-svn-id: svn://svn.forge.ocamlcore.org/svn/tuareg/trunk@496 a37b5e43-4b7f-4128-9b7a-df1949a3dd69