Merge tag 'v2.5.1' into develop

Added clear warning when locking in non-blocking mode without specifying either EXCLUSIVE or SHARED mode. Fixes #77 v2.5.1

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# gpg: Signature made Sat Jul  9 17:17:49 2022 CEST
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# gpg: Good signature from "Rick van Hattem <[email protected]>" [ultimate]
# gpg:                 aka "[jpeg image of size 9662]" [ultimate]