i18n-ja: fix some rst syntax problems

i18n-ja: synchronized with 86a3bb9c5f5c

obsolete: function and method to access some obsolete data An `obsolete` boolean property is added to changeset context. Function to get obsolete marker object from a changeset context are added to the obsolete module.

obsolete: exchange obsolete marker over pushkey For a version of the exchange, all markers are exchange. This won't scale and we will need a better protocol later.

debugobsolete: list all obsolete marker if no argument are specified

obsolete: add easy way to iterate over obsolete marker object

obsolete: helper class to access obsolete marker data

command: creation of obsolete marker * add metadata encoding/decoding ability * add a method to obsstore to help creating marker * add a debug command to create marker

obsolete: introduction of obsolete markers Markers are stored as binary records in a log structured file in .hg/store/obsstore.

histedit: mark as a first party extension