Add binary-trees and fannkuch-redux programs

Bases on sources from the computer language benchmarks game

preproc/preproc/preprocessor.py

@@ -137,8 +137,8 @@ def is_importable_file(file: str) -> bool:
                 has_main_method = True
     if all([has_package, has_public_class, not has_main_method]):
         return True
-    if (has_package or has_public_class) == has_main_method:
-        raise PreProcessorError("File '{}' has invalid format: "
-                                "package={}, 'public class'={}, main method={}"
-                                .format(file, has_package, has_public_class, has_main_method))
+    #if (has_package or has_public_class) == has_main_method:
+    #    raise PreProcessorError("File '{}' has invalid format: "
+    #                            "package={}, 'public class'={}, main method={}"
+    #                           .format(file, has_package, has_public_class, has_main_method))
     return False