NX does not support passing around FDs for local connections.

This will not cause any change in the resulting code as this variable
had been unset by default.

Fixes ArcticaProject/nx-libs#784

as it has been in the imake builds

Fixes ArcticaProject/nx-libs#783

Fixes ArcticaProject/nx-libs#780

Fixes ArcticaProject/nx-libs#779

By casting the rrScrPriv to ScreenPtr we are using the offsets from
the Screen structure for referencing data in the rrScrPriv structure
causing data corruption. As both macros use the same casting this
still works until the location where the data resides is
overwritten. For 64bit the location was the "rotations" member in
rrScrPriv which was not problematic because it is barely used. But on
32bit it was "numCrtcs" which is heavily used. On unwrap this was 0
and lead to a segfault.

Fixes ArcticaProject/nx-libs#943

Attributes ArcticaProject/nx-libs#241

No functional changes, just clarification/explanation of the existing
code.

Fixes ArcticaProject/nx-libs#926

was previously undocumented.

Fixes ArcticaProject/nx-libs#796

Fixes ArcticaProject/nx-libs#241
Fixes ArcticaProject/nx-libs#495
Fixes ArcticaProject/nx-libs#535
Fixes ArcticaProject/nx-libs#565

instead of sendSelectionNotifyEventToClient + setClientSelectionStage

Moving the client check to sendSelectionNotifyEventToClient enables us
to drop notifyConvertFailure.

and reset the lastClient variables when stage is set to None.

resolve lastClientClientPtr to process id and process name

In commit f48e2da3 I marked NX changes
by using #ifdef NXAGENT_SERVER. But I had missed that this define was
never set in mi. So let's change that now and make it work like
before.

Fixes ArcticaProject/nx-libs#926

In rootless mode some properties are private (or internal or
adminitrative). They are only required for the windows on the real X
server side that represent nxagent's windows. Those properties should
never be cloned from there to the the nxagent windows so we filter
them.

Fixes ArcticaProject/nx-libs#920

more output, correct format specifiers

reformat, extend comments, simplify ifdef