Fixed bug in ConvertingDoubleVector
DatasetsBuilder: adds .RData dataset handling
Toned down errors thrown in legacy code

EvalException results in a nice R stack track,
but RuntimeExceptions are dumped completely and very
ugly
Started cleaning up Lapack interface

- Moved to seperate class
- Corrected problem with Lg_dgesv (Fixes Issue #49)
- Added binding for chol2inv
Added support for attr(exact=TRUE) argument
Implemented gimple EXACT_DIV_EXPR operator