* Rename inputChannel,outputChannel to readerChannel,writerChannel
* Rename inputChannel,outputChannel to readerChannel,writerChannel (#772)
* Start batched-reader API mods
* Singleton-list step for reader-batching at input
* CLI options for records-per-batch and hash-records
* Push channelized-reader logic into DKVP reader
* Push batching logic into chain-transformer, transformers, and channel-writer
* foo
* cmd/mprof and cmd/mprof2
* cmd/mprof3 and cmd/mprof4
* narrowed in on regexp-splitting on IFS/IPS as perf-hit
* neaten
* channelize nidx
* cmd/mprof5
* channelize CSV reader
* channelize NIDX reader
* Dedupe DKVP-reader and NIDX-reader source files
* channelize CSV-lite reader
* channelize XTAB reader
* batchify JSON reader
* channelize GEN pseudo-reader
* scripts for perf-testing on larger files
* merge with main for #776
* Fix record-batching for join and repl
* Fix comment-handling in channelized XTAB reader
* Fix bug found in positional-rename
Logic for transforming input records into output records as requested by the user (sort, filter, etc.).:
The IRecordTransformer abstract record-transformer interface datatype, as well as the ChainTransformer Go-channel chaining mechanism for piping one transformer into the next.
The transformer lookup table, used for Miller command-line parsing, verb construction, and online help.
All the concrete record-transformers such as cat, tac, sort, put, and so on.
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