Created WinService method to check if the current process is running with an administrator token.
It returns false if
1) On Windows XP: the user is not an admin
2) On Windows Vista and above: the running process is not elevated
Added is administrator test to required actions in client, relay and server
Fixed main() return value to -1 when the user has no admin rights
Merge branch 'Win32TestAdmin' of git://github.com/hernancmartinez/dibbler
Win32 components now detect if being run with admin privileges

 Patch by Hernan Martinez

Signed-off-by: Tomek Mrugalski <thomson@klub.com.pl>