I replaced sun.io converters by an adaptor to sun.nio.cs coders

[Ulf Zibis]

Hi Sherman,

do you have some test data, so I can test against the specified "a 
buffer by buffer conversion" use scenario ?

See my changes here:
https://java-nio-charset-enhanced.dev.java.net/source/browse/java-nio-charset-enhanced/trunk/src/sun/io/ByteToCharConverter.java?rev=405&r1=354&r2=405&diff_format=s
https://java-nio-charset-enhanced.dev.java.net/source/browse/java-nio-charset-enhanced/trunk/src/sun/io/CharToByteConverter.java?rev=405&r1=356&r2=405&diff_format=s

-Ulf