- rename ext_normalise to ext_normalize
- move modules to from /usr/lib to /lib
- centralize make rules

Make the compat libs of npf extension shared libraries go to the
compat directories instead of overwriting the arch native libs.
Also, make sure the compat directories get created. Tested on amd64.

branches: 1.1.2; 1.1.4; 1.1.6;
Implement dynamic NPF extensions interface. An extension consists of
dynamically loaded module (.so) supplementing npfctl(8) and a kernel
module. Move normalisation and logging functionality into their own
extensions. More improvements to come.

NPF: Major rework -- migrate NPF to the libnv library.
- This conversion significantly simplifies the code and moves NPF to
a binary serialisation format (replacing the XML-like format).
- Fix some memory/reference leaks and possibly use-after-free bugs.
- Bump NPF_VERSION as this change makes libnpf incompatible with the
previous versions. Also, different serialisation format means NPF
connection/config saving and loading is not compatible with the
previous versions either.

Thanks to christos@ for extra testing.

branches: 1.4.28; 1.4.30;
fix error message and type of if_idx

fix error message

auto-create the log interface and bring it up.

branches: 1.1.2; 1.1.4; 1.1.6;
Implement dynamic NPF extensions interface. An extension consists of
dynamically loaded module (.so) supplementing npfctl(8) and a kernel
module. Move normalisation and logging functionality into their own
extensions. More improvements to come.

branches: 1.1.2; 1.1.4; 1.1.6;
Implement dynamic NPF extensions interface. An extension consists of
dynamically loaded module (.so) supplementing npfctl(8) and a kernel
module. Move normalisation and logging functionality into their own
extensions. More improvements to come.