Create sync-ad.ps1

Script that can be scheduled (for 2nd run and beyond) to sync Active Directory groups specified in 
<Working Directory>\AD_Group_Sync_List.txt 
Some attempt made to check for path to tabcmd.exe, and add in most common paths.
Logs output to <Working Directory>\logs\nightly-adsync.<date>.txt - .\logs folder must exist

All configuration entries are at top of script : Domain, Working Directory, Server.