Feature/update numpress

update MS-Numpress to its latest versions
- fixes some warnings from clang and gcc
- uses casts where appropriate
- fixes documentation
- some minor errors fixed 
- for full list of updates, see https://github.com/ms-numpress/ms-numpress/compare/21259b4a9eba62e8c398c2cfef4e80b875ff91d5...7c24b55b01abab8f0e943df9350046dd57a9bfad