- keypair, keyring:
-- consistent naming of methods
-- error propagation
-- no panic
- keyManager: persist, import, export, initialize and (re)set keyring
- no global public "singleton" keyring, instead interface via keyManager
- keys test
- KeyStore interface, DB and File store implementations

transitional ethutil.ReadConfig fixes in ethchain tests (they still fail...

- ReadConfig initialiser sets up global ethutil.Config via config file passed from wrappers
- does not write out adhoc default (not meant to) but creates empty config file if it does not exist so that globalconf does not complain if persists a flag
- default datadir and default config file set together with other flag defaults in wrappers
- default assetpath set together with other command line flags defaults in gui wrapper (not in ethutil.Config or ui/ui_lib)
- add EnvPrefix, to handle environment variable options too via globalconf
- this is still transitional: global Config should just be a wrapper around globalconfig config handler and should be moved to go-ethereum
- actual eth stack config should not be global instead config handled properly with explicit dependency injectioninto eth stack component instances

- package vars for tagged loggers
- weed out spurious fmt.PrintX and log.PrintX logging
- tried to second guess loglevel for some :)