Change the QPrinter::setNumCopies() API et. al.

The QPrinter::setNumCopies() and QPrinter::numCopies() will be renamed to setCopyCount() and copyCount(). In addition, the confusing semantics of the old QPrinter::numCopies(), which led to the introduction of actualNumCopies(), will be changed to always return the number of copies you intend to print. To support what numCopies() have done up to now, a new poperty will be introduce to indicate whether or not a printer is capable of handling the copies itself, or if the user needs to do the actual printing x number of times.