lib-smtp: Created test-smtp-server-errors, which tests the server's error handling.

lib-smtp: Created test-smtp-payload, which tests client<->server payload exchange.

lib-smtp: Implemented SMTP server.

lib-smtp: Implemented SMTP command parser.

lib-smtp: Implemented test suite for client errors.

lib-smtp: Dropped old lmtp-client. It is now unused.

lib-smtp: Implemented SMTP client.

lib-smtp: Implemented SMTP command reply parser.

lib-smtp: Implemented parsing, manipulation, and encoding for SMTP command parameters.

lib-smtp: Implemented parsing and encoding for common SMTP syntax elements.

lib-smtp: Implemented parsing, manipulation and encoding of SMTP addresses.

lib-smtp: Implemented generic parser for basic SMTP data items.

global: Use check-local in Makefile.am instead of overriding check directly This helps with dependency problems, like running "make check" in lib-storage without "make" first would try to compile the test programs too early and fail.

lib-smtp: smtp-submit: Made settings parseable.

lib-smtp: Link with libcharset.la to avoid errors

lib-lda: Moved smtp-submit to lib-smtp.

lib-lda: Moved LMTP client to lib-smtp. This makes the LMTP client available without dependency on lib-storage. For Dovecot v2.3, the newly created lib-smtp will evolve into a full client/server SMTP implementation. That will then remove the remaining SMTP code from lib-lda.