accesskey handling: only safe chars a-z0-9, dissable accesskey code if accesskey[] not set in backend..
no default logout accesskey
check key via char range - thx@: gharlan..
on blur: restore to laste state ..
added comment

#114
re-added logout accesskey

refs #114
fixed accesskeys

refs #114
Merge branch 'refs/heads/core/accesskey_handling'
updated xform