Release preparation : helpers/Xstring.h changed to helpers/XString.h to compile on Linux and Windows OS's

- Novelec part : added automatic type of electrometer

- communicationLink structure modified
- Range : modified to use RangeUp/Down commands

no more write_read cmd but write then read instead.

Novelec part updated

- Novelec part updated and tested !
- +no more compilation warnings

- DDC status show only errors if any
- added command to get DDC model configuration

- attributes management :
-> integrationTime, buffersize and triggerMode now well initialised

TODO : after a Start command
-> declare all attributes INVALID !?

- minor change (std::cout removed)

- Integration Mode available for DDC/SCPI devices
- tests done with a K617 (DDC) and a K6485 (SCPI)

- integration mode OK (tests done with K_486)

- TODO: DDC/SCPI
integration time for ScanServer compatibility.
report config for all DDC
add configuration in SCPI start command

- trigger mode and buffer size management added.
- TODO: DDC/SCPI
integration time for ScanServer compatibility.
SRQ management for Keithley Integration mode