that we have been seeing on lines with tabs.
It introduces the concept of "pages" which might not be the best choice
for them.... Basically, it's the part of a line that would be visible on
screen at once. the first part (visible when you open a file) is page
1... the second (you have to scroll to the right approx COLS, is 2. The
third is at approx (2 * COLS) - 7 and so on...)
It's not terribly efficient as of yet, there are probabally quite a few
redundant calls to xpt(), for instance.
git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@6 35c25a1d-7b9e-4130-9fde-d3aeb78583b8
