httpconnection: make sure to clear progress of httpsendfile at EOF read() should never raise EOFError. If it did, UnboundLocalError would occur due to unassigned 'ret' variable. This issue was originally reported to TortoiseHg: https://bitbucket.org/tortoisehg/thg/issues/4707/

py3: convert log opts to bytes-key dict Now simple log command works.

graphlog: pass function arguments without expansion It's annoying on Python 3 because keys must be unicode type. Let's stop using **opts expansion when not necessary.