fixed bug - sending a message when isds was offline caused error - as some bits of information weren't available
- added check for this case

internet media types (aka mime types) added for docx,... openoffice documents. And changed for fo and zfo to comply with ietf standard.

better error handling, no more application errors when an exception string contains non-ascii characters
fixes #2310

add some reasonable defaults to pane sizes and store their last position in config file - closes #2297 @3h

do activate_message_actions when switching to account without messages to prevent actions staying enabled

add configuration options for what gets open when application is started or account is opened - refs #2279 @2h