On Windows, though, only install the static library as dlib does not
generate any useful shared library on Windows.

This allows external project to include dlib by simply using
find_package(dlib REQUIRED)
and:
include_directories() / target_link_libraries(your_target )

Install the static library along the shared one.

The name of some CMake variables has been changed to
follow the naming in config.h (and thus get the special #cmakedefine
directives to work as expected in config.h.in)

Implementing the design discussed in issue #34 (ie, installation only
in Release mode, for unix platforms).

set_ptrm().

allow assignment statements with mixed dlib::matrix and mat(T*) expressions
that might alias each other.  Also updated BLAS bindings to bind to set_ptrm()
assignments.

Setup py

if no cmake generator is set use same logic as cmake to find default buid generator but use Win64 if the build is for 64bit Python

avoid foreign artifacts potentially left over from VM builts.

make sure --cmake can be used to pass any cmake not in the path.