branch wip-service-refactor created (now f232e28)

[Ludovic Courtès]

civodul pushed a change to branch wip-service-refactor
in repository guix.

        at  f232e28   PRELIM: services: Introduce extensible abstract services.

This branch includes the following new commits:

       new  e063047   gexp: Add 'computed-file'.
       new  40a38d4   gexp: Add 'program-file'.
       new  435e2dc   gexp: Add 'mixed-text-file'.
       new  86cebae   services: 'mingetty-service' no longer takes monadic 
values.
       new  e154b3b   system: Make service procedures non-monadic.
       new  d30b935   PRELIM: services: mingetty-service: Use 
<mingetty-configuration> objects.
       new  69c1afc   PRELIM: services: nscd-service: Fit everything into 
<nscd-configuration>.
       new  f5b2a91   gexp: Add 'scheme-file'.
       new  9327560   system: pam: Use 'computed-file' instead of 
'gexp->derivation'.
       new  f232e28   PRELIM: services: Introduce extensible abstract services.

The 10 revisions listed above as "new" are entirely new to this
repository and will be described in separate emails.  The revisions
listed as "adds" were already present in the repository and have only
been added to this reference.