llDumpList2String has changed its behaviour with respect to minus zero. Now it converts -0.0 to a string without the minus sign.
While testing this, we noticed several mismatches in the float to string conversions; the existing routine did not properly convert some values because as we discovered later, it is subject to double rounding; one of them is the built-in round-to-nearest-or-even while getting the first 7 significant digits, and the other is just an increment when the digit is a 5 or more, so round to nearest, ties away from zero, and is performed on the digit past the five or six visible digits that LSL shows.
The new code is a tad easier to understand and more robust.
A first variant of the new code is left commented out for history's sake, and will be removed in the next commit.
