Easier debugging of OUStrings

Hi,

I've introduced stream operator<< for rtl::OUString
for debugging purposes - 
you can now easily dump the content of the OUString to a
std:: stream (patch 
sal-oustring-debug.diff in [ FixesNotForUpstream ]).

Be careful, this is ooo-build only & it won't get
up-stream; see 
http://www.openoffice.org/issues/show_bug.cgi?id=65920

Example of the usage:

  ::rtl::OUString aString;
  ... something with aString ...
  std::cerr << "The string is: " <<
aString << std::endl;

I've described it in Wiki as well, see 
http://wiki.services.openoffic
e.org/wiki/Hacking#Can_I_get_a_char_.2A.2C_please.3F

One more probably not commonly known trick described there:

----- 8< -----
To print the value of rtl::OUString directly in the
debugger, you can use 
dbg_dump(). It is intended to be called interactively from
the debugger, in 
both debug and non-debug builds of OOo. You can see the
definition in 
sal/rtl/source/debugprint.cxx.
----- 8< -----

Regards,
Jan
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