Use the project name to disambiguate names in POV-Ray output.

- solidify/main.pov: change name from "Part" to "Part_batcvr"
- solidify/solid.h (povray), solidify/solid.c (sanitize, povray): use the
  project name as prefix for PGM files and a suffix for the object name
- solidify/solidify.c (main): pass the project's basename to povray()

solidify/solidify.c

@@ -14,6 +14,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include <unistd.h>
+#include <string.h>
 #include <locale.h>
 #include <gtk/gtk.h>
 
@@ -148,8 +149,15 @@ int main(int argc, char **argv)
 
 	save_project(prj);
 
-	if (!isatty(1))
-		povray(&prj->s);
+	if (!isatty(1)) {
+		const char *slash = strrchr(prj->name, '/');
+		char tmp[1000]; /* @@@ enough */
+
+		strcpy(tmp, slash ? slash+1 : prj->name);
+		if (strchr(tmp, '.'))
+			*strchr(tmp, '.') = 0;
+		povray(tmp, &prj->s);
+	}
 
 	return 0;
 }