* bin/cuirass.in: Replace λ by lambda.
* bin/evaluate.in: Ditto.
* build-aux/guix.scm: Ditto.
* examples/gnu-system.scm: Ditto.
* examples/guix-track-git.scm: Ditto.
* src/cuirass.scm: Ditto.
* src/cuirass/base.scm: Ditto.
* src/cuirass/database.scm: Ditto.
* src/cuirass/ui.scm: Ditto.
* src/cuirass/utils.scm: Remove λ* macro.

* src/cuirass.scm: Re-export (cuirass http) module.
* bin/cuirass.in (main): Run HTTP server and move the 'process-specs'
loop in another thread.

* src/cuirass.scm: New file.
* Makefile.am (guilesitedir, dist_guilesite_DATA)
(nodist_guilesite_DATA): New variables.
(pkgmoduledir): Refer to 'guilesitedir'.
(CLEANFILES): Add 'nodist_guilesite_DATA'.
* bin/cuirass.in: Use (cuirass) module.
* bin/evaluate.in: Likewise.

* tests/base.scm: Add missing 'test-begin' and 'test-end'.
* tests/database.scm: Likewise.
* tests/ui.scm: Likewise.
* tests/utils.scm: Likewise.