[doc] added vim "integration"
[fix] more file descriptor fixes
[mod] refactored chainging into buffered_*
[mod] refactored buffered pk sign/verify into public key
[enh] added hash cmdline feature
[fix] hash cmdline
[enh] added verifying sig of specific key
[enh] added back simple ecdh mode
[mod] improved simple ecdh paramhandling