Combined version of LMDB mdb.master and mdb.master3 #311

Job	Run time
Check all the features of the heed project (ubuntu-latest)	24s
Check all the features of the heed3 project (ubuntu-latest)	8s
Check the heed3-encryption project (ubuntu-latest)	34s
Test the heed3 project (ubuntu-latest)	20s
Check all the features of the heed project (macos-latest)	23s
Check all the features of the heed3 project (macos-latest)	11s
Test the heed3 project (windows-latest)	26s
Check the heed3-encryption project (windows-latest)	41s
Run the heed examples (ubuntu-latest)	36s
Test the heed3 project (macos-latest)	21s
Check the heed3-encryption project (macos-latest)	22s
Run the heed examples (macos-latest)	30s
Run the heed3-encryption examples (ubuntu-latest)	17s
Run the heed3 examples (ubuntu-latest)	16s
Test the heed project (ubuntu-latest)	44s
Run the heed3-encryption examples (macos-latest)	1s
Ensure the heed project is formatted	19s
Run the heed3 examples (macos-latest)	1s
Test the heed project (windows-latest)	1m 17s
Test the heed project (macos-latest)	42s
	8m 33s

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