Trailing whitespaces removal

* Files with trailing whitespaces :

List of files with trailing whitespaces removed :

benchsuite/bitset.ml

build/odoc_extract_mli.ml
build/odoc_generator_batlib.ml
build/odoc_tags.ml
build/packdoc.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
testsuite/test_substring.ml

* Miscellaneous :

README.folders : updated