introduce handling of notation direct key signatures, and experimental pin notation packet
Revert "Remove restriction for max parallel forks for gradle tests"

This reverts commit ce34192dbbff388c0ccd384fba15cd95075a14ca.

Conflicts:
	build.gradle
fix unit tests for ChangeUnlockParcel
add PIN as a SecretKeyType
add test case for PIN unlock
some small notation data fixes
Merge branch 'development' of github.com:open-keychain/open-keychain into development

Conflicts:
	OpenKeychain/src/main/java/org/sufficientlysecure/keychain/pgp/CanonicalizedSecretKey.java
	OpenKeychain/src/main/res/values/strings.xml