Add FOFB attribut and command

doc/doc_html/Attrcurrent.html

doc/doc_html/AttrisFofbControlled.html

doc/doc_html/AttrisLiberaControlled.html

doc/doc_html/AttrisOn.html

doc/doc_html/AttrnbErrorCounter.html

doc/doc_html/AttrnbErrorSec.html

doc/doc_html/AttrnbFrameSec.html

doc/doc_html/Attrsetpoint.html

doc/doc_html/AttrspMax.html

doc/doc_html/AttrspMean.html

doc/doc_html/AttrspMin.html

doc/doc_html/Attrvoltage.html

doc/doc_html/ClassDescription.html

doc/doc_html/CmdClearAlarms.html

doc/doc_html/CmdClearErrorCounter.html

doc/doc_html/CmdOff.html

doc/doc_html/CmdOn.html

doc/doc_html/CmdReset.html

doc/doc_html/CmdSetFofbControl.html

doc/doc_html/CmdSetLiberaControl.html