cout.  Also just made it a little nicer with regard to error handling.

written to an output stream.

setup.py: Don't fail if pip fails in cmake err msg

automatically sizes the tensor.

When cmake is not found, the error message suggests what to do to
install cmake. But if `distro` is not found and cannot be installed,
the distro specific error message cannot be shown. Hence, we simply
ignore this and continue on.

Also, make the pip install quiet so that if there is an error message
in that, the user does not get confused by it.

default value as well as the label to the default.

one of the matrices was empty.

set the size of the tensor.

setup.py: Provide instructions to install cmake

If cmake_path is not found, either cmake is not installed
or cmake is not in the PATH. Hence, we also give instructions
on how to install cmake if the path is not found.

of the parameter vectors.

save_jpeg: Use TRUE instead of true

In some verisons on jpeg, TRUE is an enum, and so `true`
fails because it is not of the enum's type. Now, all the
libjpeg calls use TRUE/FALSE.

Fixes https://github.com/davisking/dlib/issues/129

learning rate.