printing: "fix" progress indicator

In TemplateLayout, there was a progress indication, which reported
the progress - not of the actual rendering - but of adding the
dives to the "to render" list. Which is of course done in less than
a ms, making the whole thing completely pointless.

Instead, emit progress when actually looping over the dives or
statistics.

Nobody ever noticed the problem because even rendering is done in
fractions of a second and indeed is accounted to only one fifth
of the total progress.

The real purpose of this "fix" is to get rid of the getTotalWork()
function, which was just insane. Instead of asking the TemplateLayout
how many dives it rendered, this number was extracted from
global state. Simply store the number of dives in the TemplateLayout
object instead.

Moreover, fix two coding style issues:
 - "Page" variable identifier starting with a capital
 - The Printer::render() being defined (as opposed to declared) with
   a default parameter. This is not how C++'s default parameters work,
   sorry.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

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