filelog: stop proxying rawsize() (API)
This method is no longer used by external consumers. The API is
quite low-level and is effectively len(revision(raw=True)). I don't
see a compelling reason to keep it around.
Let's drop the API and make the file storage interface simpler.
Differential Revision: https://phab.mercurial-scm.org/D4750
#if no-windows no-osx
$ mkdir -p xdgconf/hg
$ echo '[ui]' > xdgconf/hg/hgrc
$ echo 'username = foobar' >> xdgconf/hg/hgrc
$ XDG_CONFIG_HOME="`pwd`/xdgconf" ; export XDG_CONFIG_HOME
$ unset HGRCPATH
$ hg config ui.username 2>/dev/null
foobar
#endif