No need to wait after Wire.requestFrom()

[Koepel]

In the file flowi2chelper.cpp is some waiting with available() and delay(), that can be removed.
After Wire.requestFrom() returns, there is no need to wait for something. The I2C transmission has finished and the received data is in the buffer. The Wire.available() only returns the number of bytes in the receive buffer (a buffer inside the Wire library).

It is possible to check the return value of Wire.requestFrom() or use Wire.available() to check if the right amount of data was returns, because with a multi-master bus and collisions, they might return 0 bytes.

int n = Wire.requestFrom(i2cAddress, dataLength);
if ( n != dataLength)
  return( false);

Wire.readBytes(data, n);
return( true);