{nx-X11/programs/Xserver/hw/nxagent/man/nxagent.1,nxproxy/man/nxproxy.1}: magicpixel takes a boolean argument for now.

Fixes: ArcticaProject/nx-libs#664

nxcomp/src/Loop.cpp: Make know the agent option 'keyconv' to nxcomp and tolerate it as a valid option.

Fixes ArcticaProject/nx-libs#630.

Attributes GH PR #651: https://github.com/ArcticaProject/nx-libs/pull/651

Backported from X.org:

commit 39ce5f1544029412f4060f3e89ce1d87222ef42b
Author: Adam Jackson <ajax@nwnk.net>
Date:   Fri Jan 6 17:05:26 2006 +0000

    Remove unused X11R4 DDX compatibility function miClipNotify.
Backported-to-NX-by: Mihai Moldovan <ionic@ionic.de>

Attributes GH PR #650: https://github.com/ArcticaProject/nx-libs/pull/650

I left out glx changes to miinitext.c for now.

Attributes GH PR #649: https://github.com/ArcticaProject/nx-libs/pull/649

Attributes GH PR #660: https://github.com/ArcticaProject/nx-libs/pull/660

Fixes: ArcticaProject/nx-libs#653
Fixes: ArcticaProject/nx-libs#639

hw/nxagent/: Stop using non-portable '__progname', set up our own 'nxagentProgName' instead and pass it around where needed.

Fixes ArcticaProject/nx-libs#639

Fixes ArcticaProject/nx-libs#639.

Fixes ArcticaProject/nx-libs#653.

Attribiutes GH PR #647: https://github.com/ArcticaProject/nx-libs/pull/647

Attributes GH PR #646: https://github.com/ArcticaProject/nx-libs/pull/646

Attributes GH PR #645: https://github.com/ArcticaProject/nx-libs/pull/645