Automated Build Generator

Never instantiate project-specs in src/model/project/*.lisp

This changes the project model from

distribution-spec -------+
              |                        |
                v                        v
  template <--- project-spec ..........> project
|             |                        |
  v             v                        v
  aspect-spec   version-spec ..........> version
              |                        |
                v                        v
                job-spec ..............> job

to

distribution-spec .....> distribution
                                       |
                                       |
  template <--- project-spec             |
|             |                        |
  v             v                        v
  aspect-spec   version-spec ..........> version
              |                        |
                v                        v
                job-spec ..............> job

This has multiple consequences:

• Lot's of code can be removed or simplified.

• Project versions can be parameterized differently in different
  distributions within the same generate execution.

• Orchestration jobs are configured in a way similar to real projects
  making the behavior more uniform. In particular, variable overwrites
  specified on the commandline are now picked up within orchestration
  jobs and aspects.

fixes #2783

• src/model/project/classes-spec.lisp (distribution-spec): added
  superclass `specification-mixin'
  (instantiate distribution-spec): new method; create a `distribution'
  instance containing `version' instances
  (project-spec): removed superclass `parented-mixin'
  (variables :around project-spec): no need to collect parent's
  variables
  (lookup project-spec t): similar
  (instantiate project-spec): removed; no longer needed
  (instantiate version-spec): pass specification to new `version'
  instance
  (instantiate job-spec): similar for new `job-spec'
• src/model/project/classes-model.lisp (distribution): new class;
  result of instantiating a `distribution-spec'
  (lookup distribution t): new method; delegate variable lookup to
  specification
  (persons-in-role t distribution): new method; delegate to
  specification
  (project): removed; no longer needed
  (direct-variables project): likewise
  (lookup project t): likewise
  (add-dependencies! project project-spec): likewise
  (deploy project): likewise
  (print-items append version): new method; print distribution,
  project and version names
  (lookup version t): new method; look up variables in specification
  and maybe in parent, i.e. distribution
  (lookup job t): new method; lookup variables in specification and
  parent
• src/model/project/progress.lisp (header): updated copyright
  (deploy :around project): removed method; no longer needed
  (deploy :around version): removed unnecessary `progress' call
• src/report/graphviz.lisp
  (graph-object-node jenkins-dependencies distribution): changed
  specializer distribution-spec -> distribution
  (graph-object-points-to jenkins-dependencies distribution-spec):
  likewise
  (graph-object-points-to jenkins-dependencies project): removed
  method; no longer needed
  (object-filename distribution): changed specializer
  distribution-spec -> distribution
  (report sequence eql :graph pathname): works on `distribution'
  instead of `distribution-spec' now
  (report version-spec eql :graph pathname): removed method; no longer
  needed
• src/report/catalog.lisp (catalog-description): works on
  `distribution' instead of `distribution-spec' now
  (project-version-name): adapted to changed project model
  (report distribution catalog pathname): changed specializer
  distribution-spec -> distribution; simplified
  (report distribution catalog stream): similar
  (report t eql :catalog t): works on `distribution' instead of
  `distribution-spec' now
• src/commands/functions-input.lisp (locate-projects): do not
  associate distributions with `project-spec' instances; those are
  independent now
  (project-spec-and-versions): removed; no longer needed
  (print-items append project-spec-and-versions): likewise
  (load-project/versioned): removed distribution parameter; returned
  `project-spec' instance does not have a parent; return
  `project-spec' instance directly, without `project-spec-and-versions'
  (load-projects/versioned): accordingly
  (group-project-versions-for-analysis): process a `project-spec'
  instead of a `project-spec-and-versions'
• src/commands/functions-deploy.lisp (instantiate-projects): removed;
  no longer needed
  (deploy-projects): renamed parameter projects -> versions
  (configure-orchestration): set up a fake `version' instance and its
  relations according to the new project model
  (configure-distribution): simplified
• src/commands/command-generate.lisp (command-execute generate):
  instantiate distributions instead of projects
  (generate-deploy): removed projects parameter
• src/commands/command-report.lisp (command-execute generate):
  instantiate distributions instead of projects
• changes.sexp (Release 0.25): added enhancement entry