merged PingRotate into PingScheduler; fixed save/load of cache to/from file; started creating DNS unittest
code now compiles and links and pings again!
merged because through Asynchronicity it is more difficult to give feedback from Rotate to Scheduler
further changes
* in cache ensure that there is not cname and ip for same hostname
* in cache remove trailing dots from hostnames
* by default ask only for [number of] updatd IPs in retrieval from resolver
* remove some left-overs from recursive resolving (e.g. Recursor creation in master)
git://developer.intra2net.com / pingcheck / commit