Added cast to lgical to string_tools, added interfaces str_cast and chr_cast, and added error checking to int and log.
Added cast to lgical to string_tools, added interfaces str_cast and chr_cast, and added error checking to int and log.

SixTrack/SixTrack,SixTrack/SixTrack,SixTrack/SixTrack,SixTrack/SixTrack,SixTrack/SixTrack,SixTrack/SixTrack