mercurial: add editorconfig
Editorconfig (http://editorconfig.org/) is a file format helping define coding
styles like spaces, tabs etc. It supports a wide range of editors. Some well-
known projects like ruby and zsh are using it already.
This patch adds a simple .editorconfig, making it clear we use 8-char tabs in
C code, 4-char spaces in Python code, and we don't keep trailing spaces.
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true