Added the FileHandle.words() method which returns an array of words;
Added the String.overlaps($str) method which returns true if two strings overlaps at some point.

Example:
	"abc".overlaps("zbz");   # true  ('b' overlaps)
	"abc".overlaps("cab");   # false (no character overlaps)

Added the String.sort() method which sorts the characters of a string. It also supports a block for a custom sort;
Minor simplifications in some .sf scripts;