- Added 2 new entities, HomoToRotation/Twist2 whose output is a ('standard') ml::Matrix

Added helper entity "MatrixRotToMatrix" to convert types where the dynamic type verification system fails.

- Updated documentation pictures

Changed import-default-paths configuration to generate the file in source include directory *then* install.

    ml::vector errorSIN cannot be plugged on
     taskSOUT (which is a sotVectorMultiBound),
    but can be plugged on
     errorSOUT (which is a ml::vector)

This reverts commit 991fd170.

Haha, IN YOUR FACE, Mailbox !
This way, both win32 and unix users are satisfied.

MailboxVector is already defined in mailbox-vector.h

The files must be distinguished:
- mailbox.hxx and mailbox.t.cpp are templates for resp. the header
and the source
- mailbox-vector.h/cpp correspond to an implementation of the
template for a maal::vector. Those are the symbols exported in the
library mailbox-vector.so/.lib
- test_mailbox corresponds to the test of Mailbox<maal::vector>