Fixes#1598
This regression was caused by #1531 - allowing the http request node
use any method.
The full fix is to identify which common verbs must not include a payload
and exclude them. GET needs fixing right now.
* 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
* new UI for parts support of SWITCH node
* update UI of SWITCH node for parts support
* add server side code of new SWITCH node
* update info document of SWITCH node
* add tests for new SWITCH node features
* add test for too many pending messages & related fixes
* fix handling when msg is undefined
* tabs -> spaces
* fixed meaning of "repair sequence" in SWITCH node docs
* add a note on restricting internally kept messages
* change label and position in menu of "pos. between" rule
* fixed typos (again, sorry)
* initial support of merge mode of JOIN node
* initial support of reduce mode of JOIN node
* update info document of JOIN node
* add tests for merge & reduce mode of JOIN node
* tidy tabs & spaces
* add test for too many pending messages & related fixes
* add an test for reduce mode of JOIN node
* change order of modes of SWITCH node
* add initial topics entry of merge mode
* fixed descriptions on "reduce right" checkbox
* fixed update of typedInput field of reduce mode
* fixed a typo in info document of JOIN node
* allow empty string in JSONata input field of reduce mode
* fixed a typo
* fixed error in reduce mode description
* initial support of BATCH node
* add concat mode & fix for docs and js code
* add tests for BATCH node
* minor correction of typo
* allow interval in float
* fixed message catalog
* add test for too many pending messages & related fixes
* update info document on batchMaxKeptMsgsCount
* fixed close callback
* fixed info document
* add initial topics entry of concat mode