replace mp_bool by stdbool
* This gives the advantage that static analysis **understands** bool,
but complains about using an enum type instead of bool.
* If stdbool.h is not desired, true/false/bool can be replaced using sed
as in the no-stdint-h branch.
* We already include stdint.h and stdbool.h is not more harmful than
this header
Execute move.sh - Rename files from bn_* to match the function names.
* git blame <renamed-file> is not affected
* git log --follow <renamed-file> can be used to show log across renames
