Clarify sqlite datatypes
Formatting KeychainDatabase
Move util.ProgressDialogUpdater to pgp.Progressable
Rename ProgressDialogUpdater to Progressable

Also fix some inconsistent usages of "progress", now using
"progressable" in all builders.
Rename setter methods for PgpSignEncrypt.Builder
Rename setter methods for PgpDecryptVerify.Builder
Merge pull request #600 from thi/rename-progressdialogupdater

Rename progressdialogupdater
Merge pull request #601 from thi/rename-builder-methods

Rename builder methods