branch wip-service-refactor created (now 2f719e2)

[Ludovic Courtès]

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

        at  2f719e2   PRELIM: services: Introduce extensible abstract services.

This branch includes the following new commits:

       new  3fb5d3e   gexp: Add 'computed-file'.
       new  24a17e8   gexp: Add 'program-file'.
       new  aa0c108   gexp: Add 'mixed-text-file'.
       new  a342078   services: 'mingetty-service' no longer takes monadic 
values.
       new  17f8a31   system: Make service procedures non-monadic.
       new  2c1e466   PRELIM: services: mingetty-service: Use 
<mingetty-configuration> objects.
       new  522d5a8   PRELIM: services: nscd-service: Fit everything into 
<nscd-configuration>.
       new  f31d5d5   gexp: Add 'scheme-file'.
       new  1b56784   system: pam: Use 'computed-file' instead of 
'gexp->derivation'.
       new  40c8288   guix system: Add '--derivation'.
       new  20f3665   system: Account skeleton API is non-monadic.
       new  1b4d664   records: Add 'define-record-type†'.
       new  2f719e2   PRELIM: services: Introduce extensible abstract services.

The 13 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.