OpenACS

- potential values: empty ("", default), "bootstrap" (referring to Bootstrap 3) and

 "bootstrap5" (referring to Bootstrap 5)

- When the value is empty then the CSS toolkit is determined based on

 the name of the theme of the current subsite. When this name

 contains bootstrap5 then "bootstrap5" is chosen as toolkit, when it conntains

 bootstrap3, then "bootstrap" otherwise it is left empty.

New parameter for acs-subsite "IconSet"

- potential values: empty ("", default), "classic" (old-style gif/png images),

 "glyphicons" (Part of Bootstrap 3), and "bootstrap-icons" (usable

 for all themes).

- When the value is empty then the iconset is determined

 based on the CSSToolkit and/or the installation of the

 "bootstrap-icons" OpenACS packages. When the toolkit is "bootstrap"

 this indicates "Bootstrap 3", and "glyphicons" are used. When the

 "bootstrap-icons" package is installed, it is used, otherwise the

 "classic" iconset is used.

- bumped version number of acs-subsite to 5.10.1d2

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