dummy INET files updated to INET 2.1 and moved to the src directory
The default mobility is now stationary for WirelessNode
The constraint area is now set automatically to the playground size
examples: INET based examples now have a separate top-level folder. Examples fixed/updated to INET2.1 + extended hybrid example to use also a 802.11 card from the INET
updated project files to build mixim without INET by default. Allows easy switching to use INET instead of the inet_stub.
updated makefile to allow switching beteen with/without INET.

use:
without inet: make makefiles
with inet: make makefiles-using-inet
fixed examples.
fixed tests to work with the INET version.
added TODO file.