added functions to remove files/directory

csst_common/utils/_io.py

+import glob
+import os
+import shutil
+
+
+def remove_files(fmt=""):
+    """ Remove files matching the specified format. """
+    for fp in glob.glob(fmt):
+        os.remove(fp)
+
+
+def remove_dir(path=""):
+    """ Remove the specified directory. """
+    shutil.rmtree(path)
+
+
+
+