Add hopla buy enchanted-armoire dryrun option for --times and --until-poor

[melvio]

E.g.:

$ hopla buy enchanted-armoire --until-poor -n
$ hopla buy enchanted-armoire --until-poor --dry-run 
You have n*100 gp, without -n this would buy n times

$ hopla buy enchanted-armoire --times N -n
$ hopla buy enchanted-armoire --times N --dry-run 
You have n*100gp, thus buying N times (when possible)
You have n*100gp, thus buying M times (where M < N, when cannot afford to buy N times)