git branches refreshed

Hi Gents;

I've created a new branch maint-5.2, containing previous maint (5.2.x ) with 
the purpose to commit fixes to 5.2.x if necessary, and merged master into maint 
(now 6.0.x).
maint should be for fixes and changes for the 6.0.x series.

master is open for development >= 6.1.x

Andrew now is the time to merge extend_initrd which worked pretty well in a 
test environment.

Please be more careful, than I have been with my first commit by old habits 
after moving branches,  when committing changes to choose the correct branch.

thx kp

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