[OpenJDK 2D-Dev] RFR: 8186306: Remove pisces from Java2D sources + build.

[Philip Race]

bug: https://bugs.openjdk.java.net/browse/JDK-8186306
webrev: http://cr.openjdk.java.net/~prr/8186306/

This fix removes the pisces rasterizer code since it is superseded by 
marlin.

In addition it removes the (always) un-used Jules code from the Xrender 
pipe-line.

This code has never been enabled as it relied on a special version of Cairo.

It could have been kept by making MarlinRenderingEngine non-final and
extending that instead, but after discussion with Clemens (author of the
xrender pipeline) it is decided to remove it too.

I have built on all platforms and tested on Linux with Xrender to make sure
there was no breakage from this removal.

Additionally I have re-moved "pisces" directories from the test hierarchy
and moved the tests there under the marlin  directory as seemed appropriate.
These tests are all valid as tests for marlin too.

One test had a system property to invoke pisces removed.

-phil