Minor fix in Parser (don't warn anymore about unused functions);
Added String.trim_beg() and String.trim_end() to remove leading and trailing whitespace;
Array.first() now has a double personality; it either returns the first element of the array, or, when a block is provided (Array.first{...}), will return the first element for which the block returns a true value; (really, this functionality is a wrapper of Array.find{...})
Added the FileHandle 'say' alias for 'println';