[amibroker] Numcolumn

[burlap58]

When I try to explore using some of the AFL from the library I'm told
I need to define the numcolumn variable. I've looked all over for that
term and found a brief definition that didn't help. It's probably in 
one of the nooks and crannies of this software, but I can't find it in
the exploration page it refers me to. Amy help would be appreciated. Lloyd