New layout engine

I decided to rewrite the layout engine from scratch, so if somebody wants to take a look at the code, I've made a separate branch:
https://freshreports.svn.sourceforge.net/svnroot/freshreports/branches/New layout engine

The current version works fine with 1 page reports, but paging shouldn't work yet.

Note that the code in the trunk is more or less the same as the last release (with paging implemented (but buggy)).