smstools3 : ADD smstools3 package

    Add smstools3 package from http://smstools3.kekekasvi.com/
    
    Tested successfull as an email/sms gateway with :
    - Device: ID 12d1:1001 Huawei Technologies Co., Ltd. E169/E620/E800 HSDPA Modem
    - Trunk: OpenWrt Chaos Calmer r43753
    - Kirkwood : Globalscale Technologies Guruplug Server Plus
    
    Send and receive SMS with modem : OK
    Forward received SMS to mailhub : OK