rebase: add the --inmemory option flag; assign a wctx object for the rebase
In the future, the --inmemory flag might be deprecated in favor of something more
intelligent (for example, always rebasing in-memory if the working copy parent
isn't in the rebaseset). But we might keep it as a way to explicitly force IMM
on or off.
Differential Revision: https://phab.mercurial-scm.org/D1232
# This config file points Mercurial at the system-wide certificate
# store from the ca-certificates package.
[web]
cacerts = /etc/ssl/certs/ca-certificates.crt