[GSoC] Improved Error Checking - Weekly Report 1

[Ben Ni]

Learning points- Attended hackfest at Cambridge, picked up lots of useful coding tips and familiarised with Calc's data structure
Progress:- Implemented formula group iterator- Display formula group count statistic- Fixed time wraparound validity check
Goals:- Implement formula group check mode- Implement "any" for data field under validity criteria 		 	   		  
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