mv index allocate to shard allocate, add explanations, fixes #71 (#75)

TODO.md

@@ -3,13 +3,7 @@
 
 - index show: add more details, see screenshots
 
-- add shard explain, aka:
-  get /_cluster/allocation/explain {"index":"yourindex", "primary": true, "shard":0}
-
-
 - add datastream support:
   https://www.elastic.co/docs/api/doc/elasticsearch/operation/operation-indices-get-data-stream
   
   also exclude data stream backing indices from index ls
-  
-- table any2string