Archipelago

Split peer request queues.

Each thread has its own peer request queue, frow which it allocates data. If
this queue is empty, it tries to "steal" from the "next" thread. This greatly
reduces lock congestion to the peer request queue.

Fix queue size of per thread queue.

Add check to not respond request if none associated.

Conflicts:
xseg/peers/user/peer.c

Make bench send requests faster

Simplify port binding code

Keep naming in peerd_loop consistent

Unify thread loop with peerd_loop

Since peerd_loop with thread_loop don't have many differences between
them, they can be unified in a single loop. TODO is to choose a unified
name for both threads and peers, as well as fault check the
implementation.

Add S_IWUSR permission bit for O_CREAT

In Ubuntu haven't tested it elsewhere yet gcc has a global cflag
called "D_FORTIFY_SOURCE=2" that errs when files are not created
with explicit user permissions. Since files are O_WRONLY, I added
the S_IWUSR permission bit.

Reimplement xseg paths and add xseg_forward

Reimplement xseg paths. Paths are a tool for the administrator to dynamically
alter a running xseg setup, by forcing a request to be submitted to a different
port than the original destination.

xseg_forward, on the other hand, allows a peer to alter the normal path of a...

make peers expect portno

add finalize function to peers and make mapper close all maps before quitting

add improved argument parsing. also add helper messages

modify logging mechanism to support redirection of std streams and logfile reopen

add pfiled based on peer skeleton

fix peer.c pidfile handling on error, plus archipelagos control file changes

mark terminated peer flag as volatile

expand gracefull exit to mt peers

merge peers skeletons