Filter compiler: exclude NULL character from STRING definition.
Stop parsing if unknown data offset is used.
Filter compiler: more fixes against null pointer dereference
Filter compiler: fix null dereference in a specific case
Merge pull request #561 from tomaszn/master

Filter compiler: fix some null pointer dereferences
replace obsolete gethostbyaddr() with getnameinfo()
threadize host resolution process
start host resolution when option is acitivated (GTK and Curses)
add IPv6 for passive name resolution
update TODO
Merge pull request #568 from koeppea/rework-dns-resolution

Rework DNS resolution
Finding also gtk3
Enabling gtk3
Add gtk3 to travis
Add gtk3 to README
Removing required gtk2
Forcing the help window size
make GTK UI compatible to GTK3
Some minor corrections
correct ifdef include for GTK3