New xfreerdp script

A few more lengthy explanations about the last two commits.

About ltsp/xinitrc:
  eval $COMMAND
breaks empty parameters and parameters with spaces. So if
  xinitrc rdesktop -u '' server
was ran, eval would instead run
  rdesktop -u server

`eval` sometimes can also be a security risk (e.g. SCREEN_07="rdesktop &
rm -rf /"), so switching to `"$@"` or `exec "@"` is usually more
appropriate.


About the xfreerdp changes.
$RDP_SOUND is no longer supported, if one wants to stop pulseaudio to
save some CPU/RAM he can set SOUND=False to prevent pulseaudio from
starting in the first place, instead of pausing it with pasuspender.

$RDP_DAEMON is also not supported, $XINITRC_DAEMON now defaults to True
for rdesktop screens to prevent X from restarting on each windows login
timeout or logout. If one doesn't want that, he can specify
XINITRC_DAEMON=False in lts.conf

$SCREEN_XX="rdesktop params" is more generic and allows for setting rdp
options on a per-screen basis.
$RDP_OPTIONS is still supported though.
$RDP_SERVER is supported too, and it now defaults to "server".


I hope I didn't break any use case, if so please tell me to fix it.


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