master updated (4db99f6 -> 8d40c49)

[Clément Lassieur]

snape pushed a change to branch master.

      from  4db99f6   database: Merge Derivations into Builds table.
       new  e66e545   utils: Avoid deadlock when WITH-CRITICAL-SECTION calls 
are nested.
       new  4612a3a   database: Serialize all database accesses in a thread.
       new  8d40c49   database: Add a Checkouts table.


Summary of changes:
 .dir-locals.el            |   3 +-
 Makefile.am               |   3 +-
 bin/cuirass.in            |  29 ++-
 bin/evaluate.in           |   4 +-
 doc/cuirass.texi          |  33 ++-
 src/cuirass/base.scm      | 127 +++++-----
 src/cuirass/database.scm  | 600 ++++++++++++++++++++++++++--------------------
 src/cuirass/http.scm      | 136 +++++------
 src/cuirass/templates.scm |  35 ++-
 src/cuirass/utils.scm     |  38 +--
 src/schema.sql            |  16 +-
 src/sql/upgrade-3.sql     |  46 ++++
 tests/database.scm        | 120 +++++-----
 tests/http.scm            |  72 ++++--
 14 files changed, 726 insertions(+), 536 deletions(-)
 create mode 100644 src/sql/upgrade-3.sql