1.bug fixing on image decoder class
2.add libconfig file for configuring the thread numbers, buffersize

the problem with stop acquisition is still there

looks like stop acquisition still has problem

the image sequence has problem,
when more than one thread is using for decoding image.
Needs to fix!!!

remove the network test parts from Eugen. It is not used any more.

forgot doing this in previous commit

12bit mode tested, works fine. But need to check if the data saved are correct.For 24bit mode, segmentation fault problem exists, looks like it is related to thread synchronization.

Needs to fix:
When stopacq called, next time, the last arrived image attribute has wrong value

1.removed redundant code.
2.Finished testing network communication,thread operation,memory operation