* changed common.c readADCFromFile to make it more general and move temperature calculation for Eiger out of this function and inside whereever it is called.
* g2 and m2: gethighvoltage was just a variable set in server, it is now moved to a get inside DAC5671 implementation (but not reading a measured value, instead what is set from a file), high voltage variable used inside DAC5671 for virtual servers
* g2: switching off hv (ifrom non zero to zero value) will wait for 10s; powering on chip reconfigures chip; powering off chip unconfigures chip; powering off chip also includes check if hv = 0, if not throw exception; chip configuration checked before acquring; at start up: hv switched off and chip powered on, so does not wait 10s to switch off hv;
* included test to check powering off chip when hv is on should throw an exception
* g2: check if chip configured before acquiring
* nios: read hv value set from file and virtual still goes into DAC5671 for conversions to and fro dac to V, change common readadc to readparameter to generalize, make sethighvoltage into a get and set to catch errors in get as well, g2: if not at startup, remmeber hv value before setting it and after check if value was being switched off (from a non zero value) and wait 10s if it was (10s wait only for switching off from non zero and not at startup)
