basically replaces lynx (or elinks, whatever), grep, and sed
- example: lynx -dump $url/downloads/|grep tar.bz2|sed 's/.*-\(.*\)\.t.*/\1/'
- new syntax should be: dumpver url grep-parameters [-n] sed-parameters
- if the 3rd parameter is -n, then use sed -n $4
- if not, use sed $3

if url starts with http://, lynx-like output is important regarding:
- dumpver should process html tags like lynx
- the references table at the bottom of the page

if url starts with ftp://, a 'wget --passive-ftp -O - -q'-like output is
required (this will be a html-source-like output)

should handle timouts, so should return with an error code if can't make the
wished output in n secons (could be hardcoded, a constant at the top of the
script if fine)