[Gzz] Benchmarks

[Matti Katila]

Hello,

I added some benchmarks for pp[press Ctrl+b] and the results are 
interesting, though:

1 : Benchmark - leave out paper :      140  frames.
2 : Benchmark - leave out shortcuts :  175  frames.
3 : Benchmark - leave out text :       252  frames.
4 : Benchmark - leave out background : 269  frames.
5 : Benchmark - leave out fillet :     122  frames.
6 : Benchmark - leave out nothing :    122  frames.

It seems that background, which is the calendar thing, eats a lot of 
power. Otoh, also text vobs take cpu cycles but not so much since there 
are so many of them. Actually text benchmark should be splitted to two:
 -don't build coordinate systems and don't draw text
 -build coordinate systems but don't draw text


   -Matti