* TOFS_pattern.md: add myself as modifier.
  Trim trailing whitespaces.
  Separate titles from first paragraph.

The example could not be used as-is. This commit improve conformity to
formula conventions.

* TOFS_pattern.md: add missing commas “,” in “map.jinja” and extra one
  to ease the addition of new entries.
  Import “map.jinja” in “init.sls” and “conf.sls”.
  Declare descriptive state IDs.
  Use the “module.function” notation.
  Use the “name” parameter.

The prefix was used for 2 purposes:

- define the pillar prefix where to lookup “:files_switch”. It
  supports the colon “:” separator to lookup in pillar subtree like
  “foo:bar”
- define the path prefix where to look for “files/”, It did not support
  separator to lookup inside directory tree.

This patch only replace any colon “:” with “/” when looking up
“files/” directory, with the “foo:bar” prefix:

- lookup “foo:bar:files_switch” pillar to get list of grains to match
- lookup files under “salt://foo/bar/files/”

* TOFS_pattern.md: document the new use of “prefix” supporting colon “:”.

* template/macros.jinja: transform any colon “:” in “prefix” by slash
  “/” to lookup files.

When the files are “full path” with leading slash “/”, the generated
URL contain a double slash because of the join.

* template/macros.jinja: remove leading slash before joining parts.

* TOFS_pattern.md: mirror changes of “macros.jinja”.

The “template” is kept during rendering.

* TOFS_pattern.md: add “template” to rendered state.

* template/macros.jinja: ditoo.