Trailing whitespaces cleaning

* List of files with trailing whitespaces removed
(also untabify'ed & ocp-indent'ed).

benchsuite/bitset.ml
build/odoc_extract_mli.ml
build/preprocess_mli/generate_mli.ml
qtest/README.md
src/batBitSet.ml
src/batBounded.mli
src/batFloat.ml
src/batLazyList.ml
src/batPrintf.mli
src/batSeq.ml
src/batSet.ml
src/batString.ml
src/batSubstring.{ml,mli}
src/batteriesHelp.ml
src/batText.mli
src/batUnix.mliv
testsuite/test_bitset.ml
testsuite/test_enum.ml

*  README.folders : updated