This function deletes an Echoview line object using COM scripting
Examples
if (FALSE) {
EVAppObj <- COMCreate('EchoviewCom.EvApplication')
EVFile <- EVOpenFile(EVAppObj,'~~/KAOS/KAOStemplate.EV')$EVFile
testline <- EVNewFixedDepthLine(EVFile = EVFile, depth = 50, lineName = "test_line")
EVDeleteLine(EVFile = EVFile, evLine = testline)
}