Fix build for recent fred, don't need to download bcprov separately now.
Trivial optimisation
Fix unit test, reject email addresses without an @
Sync on this not pluginTalker, might do odd things to fred.
pluginL10n can change, so needs either to be volatile or some synchronization.
FIXME
Simplify, get rid of list
Stricter regex for FreenetURI's (passes tests).
Global SecureRandom.
Use the global SecureRandom. Avoids significant latency.
Use SecureRandom for generating the RTS KSK too.