Fixed help in jtalkc and changed the use of readlink to simple shell code that should be portable and work in mac.
Fixed help in jtalkc and changed the use of readlink to simple shell code that should be portable and work in mac.

rbistolfi/Amber-Todo,adrian-castravete/amber,adrian-castravete/amber,amber-smalltalk/amber,matthias-springer/amber-athens,amber-smalltalk/amber,amber-smalltalk/amber,matthias-springer/amber-athens,matthias-springer/amber-athens,adrian-castravete/amber,rbistolfi/Amber-Todo