Improve error reporting for <security:runas{user,group}>.
Merge pull request #638 from SaberUK/insp20+runas-fix

Improve error reporting for <security:runas{user,group}>.
Fix m_silence looking for maxentries in <showwhois> instead of <silence>.

Fixes issue #644.
Fix issue #657, fix sending FNAME with spaces
Fix parsing ADDLINE with expiration or creation dates past ~2038 probably
Use case insensitive comparison for server names for (auto)connects, issue #662