new API call util::potentially_unsafe_eval_p
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