[Libreoffice-ux-advise] Don't show non-printing characters by default

Hi Cedric,

I've just pushed this:

http://cgit.freedesktop.org/libreoffice/core/commit/?id=40fe511d0ed56d4481cad9c278899f3b9167cdb5

both to master, as well as libreoffice-3-5 - so writing you because you
seem to have changed that to showing by default.  This does not affect
showing eg. the page breaks, they are still shown by default.

Even though I myself like to see what exactly my document is doing, the
non-printing characters are too much even for me during normal
operation; so thinking of less technical users, I don't think they want
to see the non-printing characters by default.

CCing the UX guys - I hope this change is OK, and will not create a huge
thread :-)

Regards,
Kendy