Manual: more differences between Julia and Matlab
Manual: fix formatting problems in previous commit
Define power function for Float16
Use shared utf8proc library when USE_SYSTEM_UTF8PROC=1

Distribution policies strongly discourage statically linking
to libraries in packages. We thus need to allow using the
dynamic library when building packages.
windows: use full version for install dir (fixes #5541)
Devectorize norm calculation and avoid code dublication.