RFR: JDK-8167648: java.io.PrintWriter should have PrintWriter((String|File), Charset) constructors

[Patrick Reinhart]

Added those new public constructors:

PrintWriter(OutputStream, Charset)
PrintWriter(File, Charset)
withAutoFlush()

Also added a new private constructor:

PrintWriter(OutputStream, Charset, boolean)

and rewired the OutputStream constructor calls to this private 
constructor.


Here's the webrev:

http://cr.openjdk.java.net/~reinhapa/reviews/8167648/webrev.00


-Patrick