Squashed commit of the following:

commit b4b4053
Author: Giovanni Pizzi <giovanni.pizzi@epfl.ch>
Date:   Wed Dec 15 20:20:05 2021 +0100

    AEP 006 - Efficient object store for the AiiDA repository (aiidateam#11)

commit 0a5675d
Author: Sebastiaan Huber <mail@sphuber.net>
Date:   Fri Sep 10 18:16:30 2021 +0200

    Update README.md (aiidateam#26)

commit 5b45258
Author: Sebastiaan Huber <mail@sphuber.net>
Date:   Fri Sep 10 18:14:31 2021 +0200

    AEP 004: Infrastructure to import completed calculation jobs (aiidateam#12)

commit 4855195
Author: Chris Sewell <chrisj_sewell@hotmail.com>
Date:   Sun Jan 10 15:20:52 2021 +0000

    Add Archive format AEP (aiidateam#21)

.gitignore

@@ -222,3 +222,5 @@ tags
 [._]*.un~
 
 # End of https://www.gitignore.io/api/vim,python,pycharm
+
+.DS_Store