Known bugs in these tests.

1. SAS: With pdf graphics, we get tick labels overlapping graph box.
   For that reason, we give preference to generating an EPS graph and 
   converting it to PDF (requires configuring the convertor via
   the configuration key Convert.eps.pdf.binary). Unfortunately, we
   do not get color with this approach.
   Also, ODS graphics do not work, nor do template-based graphs.
   Obviously, much to do here - for little reward, given the low
   quality of SAS graphics (RVL opinion, probably based on ignorance).

2. GenStat: I don't know how to re-size a graphics file; Also I
   don't fully understand the options to prevent dotted lines from 
   appearing sometimes in the output

3. Stata: Before 2012, an expression got passed to 'egen' for evaluation.
   I have been convinced that this is the wrong approach, and so starting
   with version 0.91, we simply pass the expression to 'display'. 
   For example, \Stataexpr{r(mean)} gets processed via 'display r(mean)'.
   This is a design change that will break old Stata source files that 
   use expressions - and I apologize for any inconvenience this causes. 
   If you want the old behavior, set the option 'egen'. This is illustrated
   in the Stata-test.swv file.