This is superseeded by the notification system.

* src/cuirass/specification.scm (%build-types): Add 'channels support.

* src/cuirass/http.scm (url-handler): Remove admin section.
* src/cuirass/templates.scm (specifications-table): Remove optional admin
argument.

* src/cuirass/specification.scm (sexp->channel): Ignore channel introduction.

The Guix version of sexp->channel doesn't support the branch field.

* src/cuirass/specification.scm (sexp->channel): New procedure.
* src/cuirass/database.scm (db-get-specifications): Use it.

* src/cuirass/specification.scm (channel->sexp): Add channel introduction
support.

* src/cuirass/specification.scm (<build-output>): Set a default path to "".

* src/sql/upgrade-2.sql: Remove it.
* src/sql/upgrade-3.sql: Remove it.
* src/sql/upgrade-4.sql: Remove it.
* src/sql/upgrade-5.sql: Remove it.
* Makefile.am (dist_sql_DATA): Adapt it.

* src/cuirass/logging.scm (log-message): Turn into a procedure.

* src/cuirass/http.scm (url-handler): Fix admin specification creation.

* src/schema.sql: Cascade Evaluations, Checkouts and Builds deletion.

* src/cuirass/templates.scm (evaluation-info-table): Improve action button text.

* src/cuirass/templates.scm (evaluation-info-table): Fix action list display.

* src/cuirass/http.scm (url-handler): Add "/admin/evaluation/<id>/cancel" and
"admin/evaluation/<id>/retry" routes.
* src/cuirass/templates.scm (evaluation-info-table): Add "Cancel pending
builds" and "Retry" buttons.

* src/cuirass/database.scm (db-cancel-pending-builds!): New procedure.
* tests/database.scm ("db-cancel-pending-builds!"): New test.

* src/cuirass/database.scm (db-retry-evaluation!): New procedure.
* tests/database.scm ("db-retry-evaluation"): New test.

* doc/cuirass.texi (Web API): Update it.
* src/cuirass/http.scm (build->hydra-build): Update it accordingly.

* src/cuirass/database.scm (db-open): Save the default database in the
%package-database parameter.

* doc/cuirass.texi: Update it.

* src/cuirass/parameters.scm (%cuirass-database, %cuirass-host): New
parameters.
* src/cuirass/database.scm (db-open): Use them.

* src/cuirass/database.scm (db-restart-build!, db-restart-evaluation!): Reset
starttime and stoptime field.

* src/cuirass/database.scm (with-transaction): New macro.