add git squash alias
git fixup/squash - need to rebase against an earlier commit,

because if the reference is specified like this: 'HEAD~2'
then after committing the fixup HEAD moves.
git fixup/squash aliases - add files automatically
build-lily: remove false report about untracked files

with --directory, ls-files listed a directory as untracked
even if it was ignored.
build-lily: add a description to the stash