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   Check content of the string to identify potentially unsafe content

   in the provided string. The content is unsafe, when it contains

   externally provided content, which might be provided e.g. via

   query variables, or via user values stored in the database. When

   such content contains square braces, a "subst" command on

   theses can evaluate arbitrary commands, which is dangerous.

The new API call is used in "::xo::Package->return_page", where the

"subst" command stripped from its command substitution capabilities.

In case, command subsitution is needed, perform this prior this call.

bumped acs-tcl to 5.10.1d23

bumped xotcl-core to 5.10.1d13

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