Removed obsolete generated tests for untracemem and added new tests for
tracemem and related.

rename BrowserQuitException to JumpToTopLevelException for more general use
refactor quit to separate cleanup action and implement GNU R semantics more closely

rename BrowserQuitException to JumpToTopLevelException for more general use
refactor quit to separate cleanup action and implement GNU R semantics more closely

Cdqrls is implemented as R function, which invokes .fastr.dqrls,
which is invokes Fortran routine dqrls through RFFI.

The new pretty-printer skeleton implementation integrated with the FastR. It supports the following data types: named and unnamed vectors, matrices, String and Double.