keep track of current construction and construction history
move duplication filtering in builsitehandler
add construction resume after interruption
dont built two factories within twenty seconds of one another
limit attacks to one per mtype or every minute
fix construction resume with CMD_GUARD
increase countbehaviour unit finished check to every frame
remove debug spam
Merge pull request #31 from zoggop/master

BA: add construction resume after interrupted by danger, limit attacks to one per mtype or every minute