create branch 2.8

--HG--
branch : 2.8
Prepare release 2.8.3

--HG--
branch : 2.8
Added tag 2.8.3 for changeset dbd0a7ddfb62

--HG--
branch : 2.8
Increase version number

--HG--
branch : 2.8
Don't copy template relation when copying an account

issue3751
review4271002
(grafted from 251fa90c3f0c355c4135624449378343184d029e)

--HG--
branch : 2.8
extra : source : 251fa90c3f0c355c4135624449378343184d029e