histedit: fix --edit-plan --edit-plan was completely broken from the command line because it used an old api that was not updated (it would crash with a stack trace). Let's update it and add tests to catch this.

merge with stable

localrepo: eliminate local requirements var in init Localrepo's __init__ function creates a local requirements set to add to before it replaces the instance's set with it. This is unnecessary, so let's just use the instance's set directly.

localrepo: rename requirements parameter in stream_in() To avoid confusion from overloading of the variable name "requirements", the requirements is renamed to remotereqs for localrepo's stream_in() function.