Round for boost control, boost display, lambda display and oil temperature display.

One of my customers want to show the values of both analog input channels on the gauge.

analog2 (after curve and scaling) can be displayed on bottom display since round firmware 1.5.8

(config.display_mode[config.disp_state] & 0xF == 9 instead of 1, which was previously not available / INVALID). After "update ini from web" should appear in VT as ANALOG2.

note to others: no reason to upgrade from 1.5.7 to 1.5.8 unless one has round v2 and wants to display analog on top, and analog2 on bottom display.

Thanks for adding this feature, Jörgen