Xpath: All subnodes selector (*)

* selects all nodes in the current record that "have a name".
XPath: subchild selector, new function upper-case

* New xpath function "upper-case" to convert a string to ....
  (upper case, of course!)
* Sub-child selectors are allowed such as
  parents/children to select all elements named "children" of all
  elements named "parents"
Bugfix font face: didn't work with string value