changegroup: rename bundle-related functions and classes
Functions like getbundle and classes like unbundle10 really manipulate
changegroups and not bundles. A HG10 bundle is the same as a changegroup
plus a small header, but this is no longer the case for a HG2X bundle,
so it's better to separate the names a bit.
comments: describe ancestor consistently - avoid 'least common ancestor'
"best" is as defined by mercurial.ancestor.ancestors: furthest from a root (as
measured by longest path).
rebase: improve description of --base
No Mercurial DAG has ever (!) been drawn in a way where 'up to' would apply.
Instead, describe deliberatey vague and informal instead of seemingly precise
but not describing the essentials:
rebase the tree around the specified changeset without ancestors of dest
fedora: remove sample.hgrc from shipped files
sample.hgrc was long obsolete and was removed in
63ed188e3fc7.