BDSKY depends on SA package

[rbouckaert]

The BDSKY package contains templates for sampled ancestor analyses that depend on having the SA package installed. Either these templates should be moved to the SA package, or there should be a dependency added to the version.xml file. For now, I added a dependency in the packages.xml file in CBAN.

[gavryushkina]

This is caused by Sampled ancestor operators and SampledAncestorLogger which is in SA package.

[gavryushkina]

If we move the template to the SA package then it will depend on BDSKY.

[walterxie]

Please note: examples/SABDSKY_sequential.xml is using SA operators. I moved it to a sub-folder "SA" under "example" folder, as a temporary solution. It will not be tested by ExampleXmlParsingTest

I also commented out BEASTLab class path in build.xml.