Minor fixes for SMSCB#1

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ervteng wants to merge 3 commits intoRangeNetworks:masterfrom

Commits on Jun 11, 2014

Changed hard-coded language code for SMSCB to 0x01, from 0x10. This displays properly on Android devices, and corresponds to English.
ervteng
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At the CBCH, the last of the four L2 frames now set the Last Block Bit to 0x03, corresponding to the end of the SMSCB message. GSM 04.12
ervteng
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Commits on Jul 2, 2014

SMSCB respects send_time
ervteng
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