view mercurial/__init__.py @ 20589:31993cd23b11 stable

merge: change the merge state serialisation to use a record based logic

The format of the file is unchanged. But we are preparing a new file with a new
format that would be record based. So we change all the read/write logic to
handle a list of record until a very low level. This will allow simple plugging
of the new format in the current code.