revlog: register changelogv2 C implementation in parsers
This allows Python code to make use of the C implementation of the changelogv2
base operations when the C extensions are enabled.
The `format_version` values are now shared between the C and Python sides,
avoiding an additional translation for the selection of the format version to
use.
Differential Revision: https://phab.mercurial-scm.org/D12179
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
end_of_line = lf
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true
end_of_line = lf
[*.t]
indent_size = 2
indent_style = space
trim_trailing_whitespace = false
end_of_line = lf