When releasing:

  - Run the test suite.

  - Run the examples.

  - Bump version in `doc/version.inc`.

  - If necessary, further bump:
      - The versions of `package provide/ifneeded` in files:
          - `lib/critcl-app/pkgindex.tcl`
          - `lib/critcl/pkgindex.tcl`
          - `lib/critcl/critcl.tcl`
      - The version in `doc/pkg_version.inc`.
