[Serdev] radius in ser 0.9.x

[Juha Heinanen]

i just checked and latest 0.4.x tag RELENG_0_4_7 does NOT include the
crash fixes.  same applies to tag RELENG_0_5_0.  

the fixes are only in versions tagged MAIN and HEAD.  i don't know what
the difference of these two is.

i would suggest that a new 0_5_0 BRANCH is created from current HEAD,
which would be used with rel_0_9_0 ser.  only bug fixes would then
allowed to this branch.

-- juha