kamiftp: fix checks between differently sized integers

kamiftp: don't walk dot Since d3e1ab0 kamiftp started to issue Twalks over ".". walk(9p) (from plan9ports) says that The name ``.'' (dot), meaning the current directory, is not used in the protocol. hinting that it shouldn't be used, and thus kamid rejects it. It's also redundant since it's always possible to do a walk to duplicate the directory fid instead of walkig "." which is what kamiftp now does.

kamiftp: backout 8f7253b29f275cfc3fd6111a54ce1cdd6622d1ee don't use funopen(3) as it's not portable, found the hard way by cage. libbsd provides a funopen(3) on top of GNU libc' fopencookie, but I'd like to avoid dependencies on functions that are hard to port to other platforms.

kamiftp: add completions This adds completions when building with readline. kamiftp now completes command name, special arguments (on/off), local paths (default readline behaviour) and remote paths. This also tells readline how to handle quotes and escape characters.

kamiftp: implement ‘rm’ command

kamiftp: implement shell-like word splitting way more useful than a dumb strsep(" ")

kamiftp: ls: accept an optional a path

__dead before the type

kamiftp: accept an optional 9p:// prefix in the connstring

kamiftp: add note to drop argv[1] handling after 0.3

kamiftp: for bell mode print \a to stderr

kamiftp: deprecate -c it's useless as -C already implies it and -C must be use when connecting with TLS. To be definitely removed after 0.3.

kamiftp: add -o to chose the path where to save the named file

kamiftp: print diognistic messages to stderr excluding the one from cmd_*

kamiftp: automatic cd or fetch on the given path before the given path was used for Tattach. Turns out at least u9fs doesn't seem to use that field for the initial directory (not sure if it should). kamiftp now always issues a Tattach with aname="/" and then does a Twalk on the path: if it names a directory, it becomes the remote working directory like a `cd' was issued, if it names a file it is fetched and kamiftp quits.