Document that env variables are preferable to cmdline options

Environment variables are passed along to child processes, command-line
options aren't.

Change-Id: Ia52c1d8cfeeb2f7490e73ac50b58ba07c2eebfa8
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Document that the -reverse option is only for debugging and its default

You should never force that option. Just let Qt automatically detect
from the environment.

Change-Id: I43ae4951969d2067cc111eff6302921a0af82658
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Doc: fix -qwindowgeometry and -qwindowtitle option docs

The former was documented twice and the latter was missing the qdoc
formatting.

Change-Id: Id8dfb21a0c2fd26134b5738448971fe2627a12d6
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Reviewed-by: David Faure <david.faure@kdab.com>
Document the X11 DISPLAY variable in the -display option docs

Change-Id: I20412616c91d187e2befc39134a480369347b8cb
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@digia.com>
Limit the QString pretty outputs to 256 characters

Change-Id: I88e71e517827af7d82e3a47d88d40787051ed827
Reviewed-by: Sergio Ahumada <sahumada@blackberry.com>