remove some S_SPLINT_S preprocessor tests
fix unused issue
Merge pull request #488 from Garonenur/unused

fix unused issue
Merge pull request #487 from Garonenur/splint_opt

remove some S_SPLINT_S preprocessor tests
add LTR* input sanity check
extend sanity check of LTRdigest input
src_clean
splint
increase minimum pdom detect length