Dot character was not considered as a valid identifier body character.


mysql-test/r/xml.result:
  Adding test case
mysql-test/t/xml.test:
  Adding test case
sql/item_xmlfunc.cc:
  Treat dot character as a valid identifier body part.
strings/ctype.c:
  Fixing to use '/' instead of '.' as a delimiter in charset file parser.
strings/xml.c:
  Fixing to use '/' instead of '.' as a delimiter.