Old generation bug corrected

[Liviu Lalescu]

I found a very interesting bug, from prehistory :-) Nobody complained, but it is a nasty bug.

I am talking as reference to official 5.17.0:

generate.cpp, line 2153, tmp_minWrong may remain INF, if there are no conflicting activities. So a very good position is rejected!!!

Thanks to yush for the persistence in finding this bug!

I really thought everything was perfect, but you can never be sure :-)

Will be fixed in the future 5.18.0 and in the future snapshot.

The bad news is that the random seeds after generation will change. And I have to recheck all my input files, some of which take hours :-(