Added support for magic Perl variables ($!, $., $", $/, $\, $@, $,)
Optimized the fh.each{} method -- now, it will read one line at a time.
Added the dir_h.each{} method to read files from a directory handle. (each file will be a string)
dir.get_files() will now return a list of strings, instead of a list of files.
Modified the Dir.concat() method to accept strings as arguments.
Fixed the DirHandle.dir() method to return the Dir object from DirHandle;
Added the File.open_rw() method;
Added the File.opendir() method to open a file as dir;
Added scripts/magic_vars.sf;
Added the Sys.open() and Sys.opendir() method which works in the same way as Perl's open and opendir functions.
	Example: var bool = Sys.open(\var fh, '<', 'file.txt');