BromoTimer board: aligned pots

Both potentiometers are aligned now. Also, manually approved DRC clearance
errors between 220V terminal pins.
Moved the SelfTest routine to user.c
Enhanced UI a bit

Added frendlier messages, and do not rewrite whole line in countdown mode, but
just the seconds. This still has some bugs, namely, then the seconds go from
hundreds to tens and from tens to ones the trailing digit is not erased.