revlog: add shallow header flag
REVLOGSHALLOW header flag to mark revlog as shallow.
The _shallow attribute of the revlog is used to check if the header flag is set.
revlog: add punched revision flag
index flag to identify a revision as punched, i.e. it contains no data.
REVIDX_PUNCHED_FLAG = 2, is used to mark a revision as punched.
REVIDX_KNOWN_FLAGS is the accumulation of all index flags.
Added signature for changeset
c00f03a4982e
Added tag 1.6.2 for changeset
c00f03a4982e