ssh: fix flakey ssh errors on BSD systems There's been a persistent issue with flakiness on BSD systems (like OSX) where the 'no suitable response from remote hg' message would sometimes not appear. This was caused by one of the earlier calls failing with a "IOError: Broken pipe". Catching those errors and printing the same message removes the flakiness. Differential Revision: https://phab.mercurial-scm.org/D687

context: add overlayworkingcontext and overlayworkingfilectx These two classes will be used extensively in the first in-memory merge milestone. Differential Revision: https://phab.mercurial-scm.org/D616

changegroup: rename getsubsetraw to makestream Now that nothing uses getsubsetraw except makestream, let's move the functionality into the makestream. This removes the last remaining excess changegroup creation function, getsubsetraw. Differential Revision: https://phab.mercurial-scm.org/D671

changegroup: remove external uses of getbundler Now that makestream and makechangegroup are the primary creation methods for changegroups, let's get rid of this rogue use of getbundler and getsubsetraw. Differential Revision: https://phab.mercurial-scm.org/D670

changegroup: replace getchangegroup with makechangegroup As part of reducing the number of changegroup creation APIs, let's replace getchangegroup with calls to makechangegroup. This is mostly a drop in replacement, but it does change the version specifier to be required, so it's more obvious which callers are creating old version 1 changegroups still. Differential Revision: https://phab.mercurial-scm.org/D669

changegroup: replace changegroup with makechangegroup As part of reducing the number of changegroup creation APIs, let's replace the changegroup function with makechangegroup. This pushes the responsibility of creating the outgoing set to the caller, but that seems like a simple and reasonable concept for the caller to be aware of. Differential Revision: https://phab.mercurial-scm.org/D668