Release preparation : threaded version (update device for a channel every second while gathering channel data every 500ms)

- length check when updating spectrum Attributes
- minor change in waveform.cpp file.

minor change

- SocketLecroy file splitted for Win32 and Linux like platforms
- Bugs fixed in SocketLecroy

Sorts attr in expert and operator view with Pogo.
Inconsistencies removed.

calculation of offset of the begining of the struct, which contains the context of the waveform acquisition, in the received block data.