Floating point URI arguments are not parsed correctly

[Izzatbek]

The function atof used in URI.cpp returns integer values for floating point numbers if an application uses locale where comma is used to separate the integer part.

Example:

URI uri("osx:?setting=1.5");
double setting = 0.;
URI::getQueryArg(uri.query, "setting", &setting);
// here setting maybe equal to 1 instead of 1.5

This can be corrected with

setlocale(LC_NUMERIC, "C")

before using the function, however we need to put the current locale back afterwards.

The easier option could be using istringstream to read the numbers, since it uses US locale by default.