Moved JUnit Library
(bugfix)(minor) testRCWB3

setMem(mem)
(minor) fix in inline.IO/inline.IOTest

(1)Added checkOpen() in IO
(2)Added comment in IOTest
New test IOTest#testClose /(fix) IO#close()

(1)Added IOTest#testClose
(2)Fixed a bug in IO#close() occuring if this Str represents stdio.
(minor) Decrease of the number of test iteration

This fix was done in order to make tests quick.
(minor)Added error msgs @IO