* Added an option to create a mountpoint with a missing directory
It skips the normal confirmation message, which makes cryfs easier
to use in scripts, or can be aliased for quicker use.
* separated basedir and mountpoint autocreate flags, and added tests
* Werror and clang-tidy fixes
added to the ChangeLog
* fixed the bugs that clang-tidy caused
never used clang before, so I don't really know what it did and why it
caused compile errors
* man page: create sections, add description
* man page: add usage information
* man page: add options and environment variables
* man page: small adjustments
