debhelper compatibility

["Francesco P. Lovergine" <frankie@debian.org>]

Hi, 

these days I found enough energy and will to work on Debian stuff after my 
past burning up in the latest years. I noticed that most (all?) of the d-gis 
packages still use dh level 10 as the base one, while 12 was yet available in 
buster to. Is that a precise choice for backporting onto old releases or what?

-cheers

--
Francesco P. Lovergine