rixx 59ae2292df [1.9.x] Fixed #24016 -- Added "Migrating data between third-party apps" howto.
Thanks to Markus, Marten and Sergei for help and review.

Backport of b7ea494d65e4d9703a0a24f0cd708293df88f48b and
c643b4c9f2acfdcb562bdbec1d74ac797b890b9b from master
2016-04-06 12:16:42 -04:00
..