largefiles: use separate try/except and try/finally as needed for python2.4 cfccd3bee7b3 introduced a try/except/finally block, which breaks compatibility with python2.4

commands: use separate try/except and try/finally as needed for python2.4 62dc0e7ab092 introduced a try/except/finally block, which breaks compatibility with python2.4

Added signature for changeset fccd350acf79

Added tag 2.0-rc for changeset fccd350acf79

Added signature for changeset 384082750f2c

Added tag 2.0-rc for changeset 384082750f2c

merge default into stable for 2.0 code freeze

rebase: simplify check for orphaned descendants

rebase: simplify set generation

rebase: add --rev option to rebase This option allow a strict set of revision to be specified instead of using -s or -b. Rebase will refuse start if striping rebased changeset will strip non rebased changeset. Rebase will refuse to work on set with multiple root.