Gillespie.
* intervals.h: Declare copy_text_properties.
* fns.c: #include "intervals.h".
(Fsubstring): Copy text properties to result string.
(concat): Copy text properties to result string.
* ymakefile (fns.o): Note that this depends on INTERVAL_SRC.
extern Lisp_Object Fnext_property_change (), Fprevious_property_change ();
extern Lisp_Object Fadd_text_properties (), Fset_text_properties ();
extern Lisp_Object Fremove_text_properties (), Ferase_text_properties ();
+extern Lisp_Object copy_text_properties ();
extern void syms_of_textprop ();