PATH: SSL flexibility and documentation

[Sorry, resending -- I first sent this from the wrong email account, and I
think it got swallowed somewhere because that address is not subscribed to the
list.]

The attached patch:

- Adds a section to the main driver README file regarding SSL.

- Adds and documents a Driver.setSSLSocketFactory, which can be
used to change the SSLSocketFactory (per my earlier response
when this came up.

Please check my use of @SSL@ in Driver.java.in. I wasn't sure whether we
consider it more important to ensure that Driver.java.in compiles against all
JDK versions, or to ensure that it has a consistent exposed interface in all
builds. I opted for the former, but the choice can be changed by removing
@SSL@ around the method declaration for setSSLSocketFactory. (Both could be
achieved at once with an ugly interface; if that's needed, I can resubmit that
way.)

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