Restructured pyalot's large-loop-compile test to check (a) that the context isn't lost during shader compilation or program linking, and that (b) compilation and linking don't take an unreasonably long time. Whether the compilation and link succeeded is no longer tested.
Merge pull request #141 from kenrussell/largeloop

Restructured pyalot's large-loop-compile test to check (a) that the cont...