src: refactoring and improvements of astraceroute

Also:
	- Remove docs, they will be replaced with manpages
	- Backup: http://pub.netsniff-ng.org/netsniff-ng/tools/
	- Remove binary files
	- Removed existing manpages, since they suck and need
	  to be rewritten

Signed-off-by: Daniel Borkmann <borkmann@iogearbox.net>
xutils: replace tv_subtract by timersub

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
netsniff-ng: do not check poll for errors

If the interface is down, we do not care, it could happen shortly
on servers, so just keep running.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Merge branch 'master' of github.com:borkmann/netsniff-ng