New trial conversion

[<es...@th...>]

This one is 58ab3388946d9312812c276fa31cc464a617b304

The longlines corrections are mostly back in.

I stuck with author-based action stamps, but the rule for filling in
time of day on a ChangeLog attribution is now much simpler:

    Due to the limitations of the ChangeLog format, attribution dates on
    these author records will be set to have the hh:mm:ss part of the
    committer date and the committer's timezone; then various tricks are
    tried to correct the timezone, including looking in the author map if
    there is one. This choice is often close to right (e.g if the
    committer is the author) and no worse than any other arbitrary
    assignment would be.

This should greatly reduce action-stamp collisions, as two
attributions have only a 1/360th chance of having the same mm:ss
part.

There's a more serious issue.

I've looked at the repo topology in detail and it turns out to be
rather a mess. Key locations in the repo are as follows.

redroot    1998-04-15 15:16:47  /Initial import of beta340./
redright   1998-04-15 15:16:52  /Initial import of beta340./
redleft    1998-04-15 15:21:47  /*** empty log message ***/
branch52   2017-05-22 01:05:26  /Tag branchpoint for 5.2;/
b52left    2017-05-21 08:00:02  /bump versioning to 5.2.rc0/
b52right   2017-05-22 01:16:28  /Note policy for new patches applied/
greenroot  1998-06-23 10:11:50  /Import of beta 347./
greenright 1999-01-14 07:00:00  /Windows linestyle fix./
v5stable   2014-08-20 08:00:01  /Start of separate branch for version 5 stable/
bump46     2011-11-22 07:00:07  /Bump stable version to 4.6;/
start44    2009-05-31 08:00:07  /Start branch for Release 4.4
jump42     2006-10-01 08:00:05  /Jump to version 4.2, 1st release candidate./
greenbug   2004-07-07 08:00:01  /Bugfix: Incorrect brace movement/

The directions 'right' and 'left', and the colors, describe the way
the graph looks under gitk (colors aren't stable, though).  Here is a
graph of the branchpoints:

redroot ---> redleft -> 4.0.2 -> branch52 --> b52left ---> master
   |                                |
   |                                +-------> b52right --> 5.2.0 --> 5.2.1
   +-------> redright -+
                       |
+----------------------+
|
+-> greenroot ---> greenright ---> 3.7.1 --> 3.7.2  --> 3.7.3
        |
        |
+-------+
|
+-> v5stable -> 5.0.[01234567] -> branch-5.0-stable
|
+-> bump46 -> 4.6.[0123456] -> branch 4.6-stable
|
+-> start44 -> 4.4.[01] -> 4.4.[34] -> branch-4.4-stable
|
+-> jump42 -> 4.2.[123456] -> branch-4.2-stable
|
+-> greenbug -> branch-4.0-stable

This is pretty badly wrong.  In fact of the three branch points - redroot,
greenroot, and branch52 - only branch52 is correct.

This kind of failure happens in cvs-fast-export as a fallback when it
encounters incomplete root tags (CVS tags associated with a branch
root).  I don't completely understand the recovery logic - I didn't
write it, and the person who did has let the details slip.  What it
tries to do (I think) is run the join point backward from the
incomplete root tag until it find something it can recognize as an
ancestor, duplicating as many common changesets as it needs to to reroot
the branch.

To rectify this for each branch, we need to locate the correct branch
point, the place where the bad root tag happened, and perform a graft.
Looking at the v5stable commit date of 2014-08-20 14:37:30 we find
these omn the master branch.

42617 2014-08-20T12:00:00Z Empirical adjustments to dashlength calculated a
42619 2014-08-20T19:32:14Z Mark as 5.1

Allowing for EDT time-zone shift it looks like the v5stable commit to
start the branch took place about 50 minutes before 5.1 was marked,
so if we transplant v5stable to be a child of /Empirical adjustments
to dashlength/ and then nuke the older commits on the branch, that should
restore the original topology.

Ethan, can you confirm that this fork point is correct?

We're going to have to do 4 or 5 similar grafts to restore the tree to
correct topology.
-- 
		<a href="http://www.catb.org/~esr/">Eric S. Raymond</a>

The most foolish mistake we could possibly make would be to permit 
the conquered Eastern peoples to have arms.  History teaches that all 
conquerors who have allowed their subject races to carry arms have 
prepared their own downfall by doing so.
        -- Adolph Hitler, April 11 1942.