[v32] more py3 doc

Andre Sailerrequested to merge
sailer/ILCDIRAC:v32_morePy3Doc into Rel-v32r0

BEGINRELEASENOTES

*Docs
FIX: Add explanation for different Python version clients

*Core
CHANGE: Make iLCDirac depend on Dirac v7r2p40

ENDRELEASENOTES

Edited by Andre Sailer

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