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Improve xlock

Remove obsolete 'who' arguement, which was used as an owner for the
corresponding xlock structure. Since xlocks now creates its own owner, theres is
no need for providing an 'owner' arguement on xq API.

Use the tuple (PID, TID, PC) as lock owner of the xseg locks.
Remove the provided owner argument and use the above triplet value as the lock
owner.

Fixes regarding xlock

Change all xlock_acquire occurrences where a dummy owner value was used, to the
new XLOCK_UNKNOWN_OWNER value.

The length passed in hexlify() must be equal to the half
of the POSIXFD_FILENAME_LEN because hexlify() computes hashes
in pairs based on the address of the signal descriptor pointer.

Also double the size of the name of the signal descriptor.

Make pointers to segment name, segment type and peer type
pointers to constant.

Also remove obsolete directories.

According to the decision of the GRNET Board of Directors,
switch license to GPLv3.

This commit will be propagated to the release
and master branches based on git flow, and the next
release will be licensed as GPLv3.

Change '/run/shm/posixfd' directory permissions from '01755'
to '01777'. An ordinary user can now create/unlink his named
pipes.

This patch set adds support for two new xseg operations:
XCREATE and XRENAME.

It also adds the necessary fields to support the assume_v0
functionality for Archipelago.

Add flags to map reply struct.

Introduce a new ZERO flag to mark the zero objects introduced by mapper and do
not exist on the backend.

Extend XSEG protocol with the X_CREATE op and the associated request data.