Merge branch 'bc/editorconfig'

To help developers, an EditorConfig file that attempts to follow
the project convention has been added.

* bc/editorconfig:
  editorconfig: indicate settings should be kept in sync
  editorconfig: provide editor settings for Git developers

.clang-format

@@ -6,6 +6,8 @@
 
 # Use tabs whenever we need to fill whitespace that spans at least from one tab
 # stop to the next one.
+#
+# These settings are mirrored in .editorconfig.  Keep them in sync.
 UseTab: Always
 TabWidth: 8
 IndentWidth: 8

.editorconfig

@@ -0,0 +1,16 @@
+[*]
+charset = utf-8
+insert_final_newline = true
+
+# The settings for C (*.c and *.h) files are mirrored in .clang-format.  Keep
+# them in sync.
+[*.{c,h,sh,perl,pl,pm}]
+indent_style = tab
+tab_width = 8
+
+[*.py]
+indent_style = space
+indent_size = 4
+
+[COMMIT_EDITMSG]
+max_line_length = 72