Only an idea how this could be approached: Remove the file as conffile and let the file be generated by postinst (and make the substitutions).
1/ remove the file as conffile
2/ In case the file does not yet exist generate the file as shiped
in the package.
3/ If and only if dbc_install is set to true, then do the substitutions
on the configuration file as previously done.
4/ If the update is from version <= 3.3.7-7.1 then it also needs to
substitute smarty_dir variable setting with
smarty_dir = "/usr/share/php/smarty3/"
But this needs also to handle the case then when the package is
purged.
Regards,
Salvatore
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