[css-gcpm] Positions from which named string is taken is too limited

Hi,

currently second argument to string() function can be "first", "start",
"last", "first-except".

In XSL-FO similar functionality is achieved by the retrieve-position
property:

http://www.w3.org/TR/xsl/#retrieve-position

There is no equivalent of "last-ending-within-page" value in CSS. This
value is useful for example when running subtotal has to be put into
page footer. So analogical value should be added into CSS.

				Jirka

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