use a random 8-bit number for CSMS reference
Use of GSM 7bit alphabet for deconding instead of ASCII alphabet
remove last character in decode 16bits to remove an undefined character
Use GSM alphabet when sending 7-bit characters
modification so that we can concatenate 2 7-bit messages
bug fix
proper 7bit decoding when there is some padding (ie concatenated messages)
Use of ESC characters from the GSM alphabet for characters surch as '€', ']', ...
Buf fix: good text length.
The encoding is separated in 2 steps now:
* first: transform text into array of number, depending of the encoding
* second: convert the array of number into a HEXA string