redirected NEWSTT to RUN, should provide some compatibility

STATUS.md

@@ -79,7 +79,7 @@ Not all of them - only these we want to have implemented.
 | `$A533`   | LINKPRG      | DONE     |                                                    |
 | `$A659`   | set txt ptr  | NOT DONE |                                                    |
 | `$A68E`   | RUNC         | DONE     |                                                    |
-| `$A7AE`   | NEWSTT       | NOT DONE |                                                    |
+| `$A7AE`   | NEWSTT       | PARTIAL  | redirected to RUN command                          |
 | `$AB1E`   | STROUT       | DONE     |                                                    |
 | `$BDCD`   | LINPRT       | DONE     | temporary implementation                           |
 | `$E3BF`   | INIT         | NOT DONE |                                                    |

c64/basic/a7ae.newstt.s

@@ -1,8 +1,18 @@
 
-// XXX provide documentation and implementation
-// see: https://www.lemon64.com/forum/viewtopic.php?t=64721&sid=bc400a5a6d404f8f092e4d32a92f5de7
-//      https://www.lemon64.com/forum/viewtopic.php?t=70680&sid=3ff66caf7f5fdf2a3c2ff2ee31fc3fd8
-//      https://codebase64.org/doku.php?id=base:assembling_your_own_cart_rom_image
+// Well-known BASIC routine, described in:
+//
+// - [CM64] Compute's Mapping the Commodore 64 - page 97
+// - https://www.lemon64.com/forum/viewtopic.php?t=64721&sid=bc400a5a6d404f8f092e4d32a92f5de7
+// - https://www.lemon64.com/forum/viewtopic.php?t=70680&sid=3ff66caf7f5fdf2a3c2ff2ee31fc3fd8
+// - https://codebase64.org/doku.php?id=base:assembling_your_own_cart_rom_image
 
 NEWSTT:
-    STUB_IMPLEMENTATION()
+
+	// XXX Real implementation is more complicated, it's actually a part
+	// of the BASIC main loop. It is, however, often called by various
+	// utilities to simply run the software which was just loaded or
+	// uncompressed.
+
+	// For now, let's cheat a little - this should provide some compatibility:
+
+	jmp cmd_run