Interesting read about final stable release

[Jean-Marc Lasgouttes]

We requested recently that LyX be updated to 2.1.5 in Ubuntu 16.04 LTS, 
since this branch is stuck with LyX 2.1 anyway. Version 18.04 LTS has 
already been updated to 2.2.4 recently.

However the first answer for 16.04 is negative, and I cannot say that I 
disagree...

Issues mentionned:
* big lyx2lyx update: what testing can we show to make sure that we dio 
not break anything?

* big boost update: at the time it looked like a good idea, but was it?

* lack of