Log to stderr instead of stdout from hix run. Fix indentation. (#2364) #3107

Job	Run time
check-materialization-concurrency	19s
cabal	9s
cabal-doExactConfig	9s
build-extra-hackages	6s
check-path-support	5s
closure-size	2s
docs	2m 30s
haskell-nix-roots-do-not-require-IFDs	29s
hix	1m 26s
hix-cabal	14s
hydra-ifdLevel-0-and-1	5m 20s
hydra-ifdLevel-2	15m 45s
hydra-without-remote-builders-ghc9102	49s
hydra-ifdLevel-3	30m 10s
hydra-without-remote-builders-ghc967	59s
maintainer-scripts	6s
multi-target	42s
nix-build	3m 15s
nix-tools	3m 46s
plan-extra-hackages	9s
runghc	9s
shellFor-multiple-package	1m 10s
shellFor-hoogle	1m 53s
shellFor-not-depends	16s
shellFor-single-package	58s
tests-benchmarks	8s
unit-tests	4s
update-docs	6s
	1h 11m 14s

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