Sync 'minimal' branch with 'master'.

.gnupg/gpg.conf

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+# Set the default key if more than one secret key exists.
+# default-key 25C87CDF83673730
+
+# By default, use the default key as the recipient.
+default-recipient-self
+
+# Options for listing keys.
+list-options show-std-notations
+
+# Options for verifying keys.
+verify-options show-std-notations
+
+# Display LATIN1 characters.
+display-charset iso-8859-1
+
+# Automatic key location search options.
+auto-key-locate cert keyserver ldap hkp://subkeys.pgp.net
+
+# Retrieve keys from keyservers when validating.
+auto-key-retrieve
+
+# Show full keyid and fingerprints.
+keyid-format long
+with-fingerprint
+
+# Options for retrieving keys from keyservers.
+keyserver-options include-subkeys
+
+# Get rid of the copyright notice.
+no-greeting
+
+# Use loopbacking to obtain passphrases.
+pinentry-mode loopback