Build as shared + Migrate testing to Python

[alrevuelta]

Fix #60

• Migrates all testing of operators and models to Python, by building a shared library and interfacing to it from Python.
• Migrates the benchmarking of models to Python. Now there is no need to use files.
• Simplify the Makefile.
• Proof of concept before using new test data (organised by opset version and domain in Crawl previous onnx tests #67)

[nopeslide]

Nice start

static library

shouldn't this be dynamic/shared in the PR text?

[alrevuelta]

shouldn't this be dynamic/shared in the PR text?

You are absolutely right.

I'm gonna need a bit of help with the Makefile, might be doing really nasty stuff. Can you have a look? The main problem now is that we need to compile with the -fpic flag all the code, but we only want this for the shared library. Should be have a target like compile_shared or something like that?