Enhancement of PrintSpace()

[Dmitry-Frantsev]

Hi developers. I'd recommend to enhance XMLPrinter::PrintSpace() function. I have added ability to use TAB characters to format paddings. If we init "_spaceMode" member with value >=0 we will get the same result as in the original implementation. If we init "_spaceMode" member with value <0 will use TAB character for paddings. Using TAB character instead of default four spaces can reduce size of XML file up to 15%.

void XMLPrinter::PrintSpace( int depth )
{
	char	spaces[ENTITY_RANGE];
	size_t	size;
	if (_spaceMode<0)
	{
		for(int i=0; i< -_spaceMode; ++i)
			spaces[i] = '\t';
		size = -_spaceMode;
	}
	else
	{
		for(int i=0; i<_spaceMode; ++i)
			spaces[i] = ' ';
		size = _spaceMode;
	}

      if (size!=0)
		for( int i=0; i<depth; ++i )
		{
			Write(spaces, size);
		}
}