change logic for customizing log filename - a) it's not helpful for complex combinations of targets/tags to overwrite the main ("all") build log and b) having separate logs for each tag is not actually very useful and leads to loads of log files accumulating; a betetr strategy is jsut to add -custom for anything other than "all"
change logic for customizing log filename - a) it's not helpful for complex combinations of targets/tags to overwrite the main ("all") build log and b) having separate logs for each tag is not actually very useful and leads to loads of log files accumulating; a betetr strategy is jsut to add -custom for anything other than "all"

xpybuild/xpybuild,xpybuild/xpybuild,xpybuild/xpybuild,xpybuild/xpybuild