.editorconfig

tests: use debugdeltachain where appropriate

Some tests are verifying delta chain type things. This metadata
has more to do with a revlog implementation details than index
data, which is theoretically generic.

This commit ports some tests to `hg debugdeltachain`, as it is the
more appropriate debug command for looking at delta metadata.

Differential Revision: https://phab.mercurial-scm.org/D3026

# 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