#2813 support of CP encoding

[treaki]

hi,

i tried today use the CP850 encoding in some MUAs.

ive got result:

mutt Works
Icedove (Thunderbird) Works
web.de (german freemailer) Works
gmail (google mail) does not work
SquirrelMail (best web MUA ever existed) does not work :(

so could you please add support for encodings like CP850

i send you an example mail as attachment to test it yourself.

md5sum test8.eml
a23f66c9c4dcef4bce0384f97f46a5a8 test8.eml

sha256sum test8.eml
0b093cfd843d2736c5532f4c036837a78907982d08f22482e94934745af61120 test8.eml

File: „test8.eml“
Size: 666 Blocks: 8 IO Block: 4096 reguläre Datei

greetings treaki