Merged multithread pipeliner into master
Added monkey patch to stub out plot() for tests
Stubbed out some functions in graphics package for release

Graphics support is only half started, but many examples
in CRAN packages call plot, resulting in failed tests.

Rather than causing an error, calls to plot() and hist()
will only generate a warning message
Implemented BIT_AND_EXPR operator
Added fix for variable names that conflict with Jimple
reserved words.
Imported ks.c from GNU R