TST: optimize/linprog: docstring -> comment, due to nose
TST: optimize/linprog: add test for Bland's rule
ENH: optimize/linprog: deal with unknown parameters, and add some tests
BUG: optimize/linprog: fix bug in argument checking
BUG: optimize/linprog: fix issues in simple bounds specification
ENH: optimize/lingprog: raise ValueError on invalid input, rather than returning with error code
merged changes from https://github.com/pv/scipy-work.git branch pr-3342