Wireless Tools v26

Version 26 adds :

Fix bugs in parsing encryption keys and setting encryption on in iwconfig.
Update distribitions specific documentation in DISTRIBUTIONS.txt
Really allow compile without maths library for embeeded platforms
Support new iwspy features (setthr and related event) (WE-16)
Add tool redirector for people having multiple kernels with different Wireless Extension versions (WE-16)
Various trivial bugfixes and cleanup
Various Makefile and and iwlib improvements