2.5: Error reporting

* Added a report list to operator, to which they can report errors and
  warnings. When the operator ends, it will display them with a popup. For
  python these should become exceptions when calling operators.
* Added a function to make a popup menu from a report list.
* Also added a utility function to prepend a string before the reports to
  indicate what they relates to. Also made the report functions used
  BLI_dynstr to simplify the code.
* Made file reading and writing report errors to the user again using this
  system, also replacing the left over uncommented bad level error() calls.

source/blender/editors/include/UI_interface.h

@@ -40,6 +40,7 @@ struct AutoComplete;
 struct bContext;
 struct PointerRNA;
 struct PropertyRNA;
+struct ReportList;
 
 /* uiBlock->dt */
 #define UI_EMBOSS		0	/* use one of the themes for drawing */
@@ -216,6 +217,7 @@ void uiPupmenuOkee(struct bContext *C, char *opname, char *str, ...);
 void uiPupmenuSaveOver(struct bContext *C, char *opname, char *filename, ...);
 void uiPupmenuNotice(struct bContext *C, char *str, ...);
 void uiPupmenuError(struct bContext *C, char *str, ...);
+void uiPupmenuReports(struct bContext *C, struct ReportList *reports);
 
 /* Block */