PR210, missing TEMPLATES configuration templates and install changes.

[rasmunk]

I think since this PR introduces the [TEMPLATES] section as part of the overall Configuration, that the changes to

mig/install/MiGserver-template.conf in
https://github.com/ucphhpc/migrid-sync/pull/453/changes#diff-06cf401f53a7081d1af9c6c0ea2c4752f5d4726a288fc86912e63dc0740e8eec

and mig/shared/install.py
https://github.com/ucphhpc/migrid-sync/pull/453/changes#diff-aef9158f13f295cb08c3fe607c954b19860974733bc9f73b989ee583abec91e8

in #453 should be pulled into this one to have it be a unified introduction of it

[albu-diku]

Addressed in df0c8a2.