I'm away / viewer patch

[Roland Illig <roland illig gmx de>]

Hi,

I'll be away from the computer for about one month. Don't expect me to 
do anything in this time.

Concerning the patches for the viewer: I had left out the discussion 
about the patch and have committed one myself. It's completely rewritten 
and it works for me. The only part that still uses the old code is for 
text mode with line wrapping enabled. The other modes should be easier 
understandible than before. Especially I did not use the ?: operator. ;)

I had especially focused on only doing non-overflowing arithmetics. 
Instead of

a -= b;
if (a_too_small) {
    correct(a);
}

I used

if (a > b) {
    a -= b;
} else {
    a = other_value;
}

Using this style it's more unlikely to get into an endless loop as before.

Roland