Tests for InfSOCSol
"Example A" from the manual
Puritan tests (not working)
Viability kernel for fisheries problem (used in tests)
Some fixes to tests
Add LineWidth setting; fix some Octave-related issues
Minor tweaks to policy improvement method

 - iss_solve now selects a "UStart" value, and passes it through to
   iss_polimp.
 - statistics on error flags returned by polimp are reported after the
   final iteration.
Remove pure-based tests