Clean Up Configuration

[jeremykubica]

With PR #403 we moved from a per-image, per-vector encoding to a single encoding size for both psi and phi vectors. This allows us to simplify some of the configuration and interfaces. Specifically:

• Replace configuration parameters encode_phi_bytes and encode_psi_bytes with encode_num_bytes.
• Remove structs scaleParameters and PerImageData.
• Replace uses of PerImageData with a vector of times (the only data it still needs to carry around).

This PR also applies clang format to files that have changed recently and combines multiple tests in test_search_encode.py using unittest's subTest functionality.