debugger: better remote debugging

Add option to specify location of debug information to dialog.
Default is sysroot + usr/lib/debug.

Change-Id: I8c2ab448f4aba9385da617d23419e521e3ae263c
Reviewed-on: http://codereview.qt-project.org/4919
Reviewed-by: hjk <qthjk@ovi.com>

src/plugins/debugger/debuggerstartparameters.h

@@ -108,6 +108,7 @@ public:
     bool useServerStartScript;
     QString serverStartScript;
     QString sysroot;
+    QString debugInfoLocation;
     QByteArray remoteDumperLib;
     QByteArray remoteSourcesDir;
     QString remoteMountPoint;