BUG - PTU::getMode() returns wrong value (flir D48E)

[marklewis3000]

EASY FIX: compare to uppercase

The D48E responds to the 'C' query control mode with an uppercase 'P' or 'I', but the driver.cpp compares to lowercase, resulting in an error returning (-1) :
if (buffer[2] == 'p')
return PTU_VELOCITY;
else if (buffer[2] == 'i')
return PTU_POSITION;

This could be fixed like this:
(buffer[2] == 'p' || buffer[2] == 'P' )
(buffer[2] == 'i' || buffer[2] == 'I' )