* Makefile.am: Add new classes
	(core_java_source_files): CharSequence
	(ordinary_java_source_files): Authenticator, PasswordAuthentication
	* Makefile.in: regenerate
	* gcj/javaprims.h: ditto
	* java/lang/CharSequence: new class from Classpath
	* java/lang/String.java: implements CharSequence
	(subSequence (int,int)): new method
	* java/lang/SubString.java: implements CharSequence
	(subSequence (int,int)): new method
	remerge comments with Classpath
	* java/net/Authenticator.java: new class from Classpath
	* java/net/PasswordAuthentication.java: ditto

From-SVN: r45969