[shepherd] branch wip-fibers created (now abbdd1e)

[Ludovic Courtès]

civodul pushed a change to branch wip-fibers
in repository shepherd.

      at abbdd1e  service: 'make-forkexec-constructor' spawns a logging fiber.

This branch includes the following new commits:

     new f7a28cd  shepherd: Factorize out the main loop.
     new 70729b6  build: Drop support for Guile 2.0.
     new 934204f  Use Fibers.
     new fae59fb  build: Capture the source and object directories of Fibers.
     new 9cede90  shepherd: Use one fiber for signal handling, and one for 
clients.
     new 6b1daab  service: 'read-pid-file' no longer blocks.
     new 58b34b3  service: 'read-pid-file' uses (@ (guile) sleep) when it's not 
suspendable.
     new b7cf0ee  shepherd: Encode log as UTF-8 unconditionally.
     new abbdd1e  service: 'make-forkexec-constructor' spawns a logging fiber.

The 9 revisions listed above as "new" are entirely new to this
repository and will be described in separate emails.  The revisions
listed as "add" were already present in the repository and have only
been added to this reference.