Since the window borders are unknown for a short time after window creation on
Linux, restoreWindowStateFromString() needs to adjust the restored position
before passing it on to the XWindow system.

The adjustment is dependent on whether we use the native or the JUCE titlebar.
Hence the adjustment can only be correct if the titlebar configuration has
already happened before calling restoreWindowStateFromString().

Some NI plug-ins really don't like it if you call [NSApp stop] while they are still loaded.

Fixes #89

Also on OSX, changed the location used for interprocess lock files to /var/tmp - this may affect applications which try to share locks with older builds of the same app.