[QGIS-Developer] Documentation and algorithm news

[matteo]

Hi all,

in the last weeks I've pointed out some problems we can have we the
documentation, so, together with Richard, these are the conclusions:

* documentation repo will be branched together with QGIS release
* having these branches allows doc writers to update QGIS but,
especially, Processing Help files
* if you devs change something that is linked to Processing algorithm
(new algorithm OR changes to some parameter of existing algorithm) could
you please add the tag "ALGCHANGE" (other name suggestions are welcome)
in the commit message? This will open an issue in the doc repo with a
correct label (and hopefully assign this to me)


With this system we will have (at least) the chance to have Processing
Help updated and not loosing all the work done till now.

Feedbacks are more than welcome

Cheers and thanks to Richard for all the inputs!

Matteo