evolve: warn user if cset desc is being lost
In public divergence when merging results in same as public cset,
we only create markers to solve the divergence i.e. [(public, (other,))]
In this case if other cset had a desc which was different from public
that will be lost.
So this print out a warning message to user that desc of non-public
cset is being lost.
Changes in test files reflect the added behaviour.
-------------------------
Evolve Commands Reference
-------------------------
.. highlight:: none
amend
-----
.. hghelp:: amend
evolve
------
.. hghelp:: evolve
fold
----
.. hghelp:: fold
metaedit
--------
.. hghelp:: metaedit
next
----
.. hghelp:: next
obslog
------
.. hghelp:: obslog
pdiff
-----
.. hghelp:: pdiff
previous
--------
.. hghelp:: previous
prune
-----
.. hghelp:: prune
pstatus
-------
.. hghelp:: pstatus
split
-----
.. hghelp:: split
touch
-----
.. hghelp:: touch
uncommit
--------
.. hghelp:: uncommit