Bug#500451: tdsodbc: transfer the last character to next field

[ZIGLIO, Frediano, VF-IT]

Problem is related to how FreeTDS use iconv and shift state. Last characters (I 
don't
understand why) left in iconv as the shift state. Adding a 

tds_iconv(tds, char_conv, to_client, NULL, NULL, outbuf, outbytesleft);

line before return in read_and_convert and removing assert for 
inbuf/inbytesleft in
tds_iconv fix the problem.

freddy77

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