TRestRawFeminosRootToSignalProcess sets a wrong timestamp

[AlvaroEzq]

The timestamp of the event is not set correctly in this line:

rawlib/src/TRestRawFeminosRootToSignalProcess.cxx

Lines 126 to 127 in a4ba0c1

	// TODO: double check this is correct
	fSignalEvent->SetTime(fInputEventTreeTimestamp / 1000, fInputEventTreeTimestamp % 1000);

This is due to the fInputEventTreeTimestamp being in milliseconds and the method TRestEvent::SetTime second parameter is nanoseconds. So the subsecond information of the timestamp is not correct. This should be solved easily by just changing that line to
fSignalEvent->SetTime(fInputEventTreeTimestamp / 1000, fInputEventTreeTimestamp % 1000 * 1.e6);

[lobis]

Feel free to do the PR @AlvaroEzq if this is just a single line change (probably takes less time than actually writing the issue!).