initial omp test
basic omp nodes and tests for codegen
don't print semicolons after OpenMP statements
force arguments to influence transformation only through program_config
implement runtime statistics
use ctree.dotgen instead of AstToDot
implement CtreeNode.insert_before so we can prepend stmts with omp pragmas
better error msg
load libiomp
only warn if omp runtime doesn't load
i confused tx and xf
use llvm.core's library loader
use standard dot generator