PHILADELPHIA — The signs were chilling — and hiding in plain sight. Neighbors of the Philadelphia house of bizarre horrors tied to the disappearance of at least two women describe the current owner as a “psycho’’ who helped turn the once-quaint townhouse into an eyesore with boarded up windows, bars on the doors and security cameras. The father of current owner Eugene Horsch was even more sinister. RC Horsch, who died last year, was an infamous photographer whose work allegedly deviated into