Fix for calliper

Stupidly didn not realise that calliper results
have well numbers that are zero padded
Thi stwo lines can do teh same job. The first line pads zero if only on edigit after :. The second one removes : if the first one had no effect.
$well =~ s/\A([[:upper:]]):(\d)(?!\d)\Z/${1}0${2}/sxm;
$well =~ s/://sxmg;