Davod

Results 2 issues of Davod

This pull request merges updates from Martin (adding content to README.md), change optimisation flags at MAKEFILE, and use the actual GPL2 text rather than a reference.

**This pull request changes the following:** * **Makefile:** Change `-O0` by `-Os`, to leave the most optimisations. * **src/file_cache_row.cpp:** Adds `#include ` and replace `return 8 + **ceil**` by `return...