#280 IMAP SEARCH CHARSET US-ASCII fails

[Peter Chubb]

RFC3501 says:
,----
| If the server does not support the specified [CHARSET], it MUST
| return a tagged NO response (not a BAD). This response SHOULD
| contain the BADCHARSET response code, which MAY list the
| [CHARSET]s supported by the server.
`----

But davmail gives me this:
[08:16:08] <-- elmo-imap45 uid search CHARSET us-ascii from Hershberger
[08:16:08] -> elmo-imap45 BAD unable to handle request: Unsupported charset US-ASCII
elmo-imap45 BAD arrived

I expect:
1. That US-ASCII would be supported, and
2. Accurding to the RFC if it isn't, then a NO response not a BAD response would be generated.

[Peter Chubb]

Here's a patch that fixes the first issue; I couldn't work out how to fix the second.

[Mickael Guessant]

Patch merged ... a while ago