* Rewording some of the message sequence nodes
* Fix batch test for overlap renaming
* Finish msg-sequence node help rewording
* Rename maxKeptMsgsCount to nodeMessageBufferMaxLength
* Rename nodeMessageBufferMaxLength in tests
* Remove Join-merge mode for later rework
* initial support of SORT node
minor fix of sort node
fixed error message of sort node
fixed error handling of SORT node
add test case for SORT node
make limit of messages count computed once in SORT node
* update type in message & info description
* fix handling of pending messages in SORT node
* initial support of SORT node
minor fix of sort node
fixed error message of sort node
fixed error handling of SORT node
add test case for SORT node
make limit of messages count computed once in SORT node
* update type in message & info description