* Function-pointerize IXS/IXSRegex to reduce runtime iffelsing
* remove IsRegexString and SuppressIXSRegex
* regression tests passing
* doc updates
* Don't use sed -I in ./configure
* Work around Go strconv's allowance of _ in int/float literals
* JIT mlrval type-interfence: mlrval package
* mlrmap refactor
* complete merge from #779
* iterating
* mlrval/format.go
* mlrval/copy.go
* bifs/arithmetic_test.go
* iterate on bifs/collections_test.go
* mlrval_cmp.go
* mlrval JSON iterate
* iterate applying mlrval refactors to dependent packages
* first clean compile in a long while on this branch
* results of first post-compile profiling
* testing
* bugfix in ofmt formatting
* bugfix in octal-supporess
* go fmt
* neaten
* regression tests all passing