FpDebug: Replaced several writeln's with DebugLn's, since WriteLn does not work well on Windows GUI-applications. This messes up the output of console-debuggers, but that needs some re-modeling anyway.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@44620 4005530d-fff6-0310-9dd1-cebe43e6787f