Java examples to match similarly named examples from C.
These allow a Java version of documentation to show real example fragments.
refs #1130.
Multiple language doc support.  refs #1130.

doxfilter modified to know about new macros: @m_page, @m_if, @m_else, @m_endif.
Pages with @m_page have all its snippets/subpages point to the language
specific example/subpage.

The java examples directory added to EXAMPLE_PATH in Doxyfile.

Added @m_page to any doc page that also needs a Java version.

Added cast to wiredtiger.i for stricter compiler checking.
Merge branch 'develop' into java-doc-examples
Make sure the Java examples are built along with the API.  Make section names language-specific to avoid errors from newer releases of doxygen.
Merge pull request #1258 from wiredtiger/java-doc-examples

Java doc examples