[Serusers] New bugfix version of radiusclient library (0.4.1)

[Maxim Sobolev]

New bugfix release is available, main changes:

- Fixed a critical bug - if request contains any string attributes with 
length of 6 symbols, an incorrect secret can be user resulting in auth 
reject;

- string attributes now can be zero-length. Beware: it resulted in 
ABI/API breakage.

Due to the first item above update is strongly recommended to all 
current users. Please note that you need an updated cvs version of ser, 
since I've committed changes necessary to work correctly with new 
version of rc_avpair_add() function.

As usually, bug any reports, suggestions or  patches are highly 
appreciated.

Download here: 
https://developer.berlios.de/project/showfiles.php?group_id=1208

-Maxim