Crashing is some situation is not a good idea. If the other process is dead, it has probably already crashed, so crashing again would overwrite the core file, and in every case it doesn't tell us much. It's more interesting to see why the first process crashed in the first place.

* loading animation * add url to struct tab

* add a mising `&& isspace(buf[0])' that would make the parser skip the link label * swap alt and line: line is the text, alt the URL * text is always defined, at worst is a copy of URL

cmd_{previous,next}_line used COLS and LINES, this adapts them to body_{cols,lines}. While there, also add the ability to scroll when trying to go past the beginning/end of the screen.