Support Scandinavian alphabets, described in RFC2812, 2.2.

Support Scandinavian alphabets, described in RFC2812, 2.2.

* riece-inlines.el (scandinavian-downcase): New inline function.
(scandinavian-equal-ignore-case): Rename from
string-equal-ignore-case.
(scandinavian-member-ignore-case): Rename from
string-list-member-ignore-case.

* riece-identity.el (riece-identity-equal): Rename from
riece-identity-equal-no-server; use scandinavian-equal-ignore-case.
(riece-identity-equal-safe): Rename from riece-identity-equal.
(riece-identity-member): Rename from riece-identity-member-no-server.
(riece-identity-member-safe): Rename from riece-identity-member.
(riece-identity-assoc): Rename from riece-identity-assoc-no-server.
(riece-identity-assoc-safe): Rename from riece-identity-assoc.