Eliminate FileDataCollector.prev_rev field. Use _RevisionData.parent instead.
* cvs2svn_lib/collect_data.py (_RevisionData.parent): Improve comment.
(FileDataCollector.prev_rev): Remove field.
(FileDataCollector.define_revision,
FileDataCollector._set_branch_dependencies): Don't set prev_rev.
(FileDataCollector._resync_chain): Take a rev_data as an argument
instead of (current,prev). Base chain traversal on
_RevisionData.parent instead of prev_rev map.
(FileDataCollector.tree_completed): Call _resync_chain() with new
arguments.
(FileDataCollector.set_revision_info): Use _RevisionData.parent
instead of prev_rev.
git-svn-id: http://cvs2svn.tigris.org/svn/cvs2svn/trunk@2088 be7e6eca-30d4-0310-a8e5-ac0d63af7087