allows character properties in charset
allows character properties in charset

Ignore-this: 130c17481bce51a5d3730ff1dd6b5037

darcs-hash:20100119183514-c41ad-f815fb5f69211e6b3c58d3391c380eca3f43fd2d

vbmithr/ocaml-text,vbmithr/ocaml-text