unix like "netstat" tool for os4, v1.1

@kas1e
Just checked your sources. While most of if it is very good already some suggestions to make it more AmigaOS like and more user friendly:
- Replace your custom parse_args() function using the usual AmigaOS dos.library ReadArgs() function for parsing shell command arguments. Even if it's not the usual AmigaOS syntax, a template like "-a=--all/S,-l=--listening/S,-n=--numeric/S,..." is of course possible as well. And maybe even more important: A probably less known feature of ReadArgs() is that the first "foobar ?" displays the template of the command, but entering "?" again at that prompt can display additional information/help for the command, or even a complete man page of it.
- Your sources include severallines, which is very good, but only usable for people like you and me who know those error codes inside out. For casual users something likeinstead might be of some additional help.

At least newlib includes the strerror() and _strerror_r() functions, and of course the AmigaOS port uses the same errno ENUMs as bsdsocket.library does, but I guess it's the same for the AmigaOS 4.x versions of the clib2, clib4, ixemul, libnix and vclib C libraries as well.

Edit: Additional problem: can't work!
Like all printf-like functions in AmigaOS it's based on the IExec->RawDoFmt() function, or after locale.library was loaded by it's ILocale->FormatString() replacent (not by it's Ilocale->FormatString32() function!).
For compatibility to AmigaOS <= 3.x/m68k software all integer arguments on the stack of RawDoFmt(), and any functions using it, are interpreted like on real m68k CPUs: %d = 16 bit (int16/uint16), for 32 bit integers (int32/uint32) you have to use %ld instead of %d to make it work.