obsolete: move old format stuff at the end

obsolete: introduce an extension helper and use it this extension helper allow most of setup operation to be declared in place using decorator. This allow clear separation between independant part of the code. This is the first HUGE wave of changes related to this introduction. The goal is to have a clear distinction and documention of every part of this extension.

obsolete: remove 2.2 compat hack

merge with stable

Added tag 0.7 for changeset 1b2757c1bd91

changelog: update changelog for all missing version

enable: update check to ensure people use 2.3

obsolete: remove unused BC code

hgignore: ignore the "common" tests/easy_run.sh file

test: drop old BC clause

merge

evolve: make graft wrapper handle --rev

evolve: graft --continue is optional, test

evolve: avoid duplication in graft wrapper