Some printing related improvements:

* libprint based drivers can now show a preview window and show progress
  window while printing contributed in part by Hartmut Reh.
* Libprint and PCL6 driver bug fixes.
* Code clean-up (removed code duplications, coding style, copyright text)

Builds under Linux. Not tested under BeOS.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@19882 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/print/PrintTransportAddOn.h

@@ -27,8 +27,8 @@ THE SOFTWARE.
 
 */
 
-#ifndef PRINT_TRANSPORT_ADD_ON_H
-#define PRINT_TRANSPORT_ADD_ON_H
+#ifndef _PRINT_TRANSPORT_ADD_ON_H
+#define _PRINT_TRANSPORT_ADD_ON_H
 
 #include <image.h>
 #include <DataIO.h>
@@ -38,4 +38,5 @@ THE SOFTWARE.
 // to be implemented by the transport add-on
 extern "C" BDataIO* instantiate_transport(BDirectory* printer, BMessage* msg);
 
-#endif PRINT_TRANSPORT_ADD_ON_H
+#endif
+