17 minor GUI fixes and updates.

-- DONE Change Address Book to Contacts on main menu.
-- DONE Add address book button to main transaction history. Like a big one.
-- DONE On compose dialog, after "Via" drop-down, add a tiny button to pop up the p2p transport dialog.
-- DONE Change "My Identities" to just say "Identities"
-- DONE Add connect string sample to GUI:  127.0.0.1,8442,username,password
-- DONE Move "Crypto" menu to just under "Transaction History"
-- DONE When I get the output from signing, it says "WARNING: You are strongly advised to first SAVE a copy!"
-- DONE Go ahead and turn this off ONLY for signing/encryption etc. (Keep it on for cash output, but turn it off for encrypted/signed message output.)
-- DONE Turn it off also for the "verified" dialog.
-- DONE Also, that dialog has a window title of "Dialog" so fix that.
-- DONE Sign/Encrypt dialog should Signing Hand icon next to "Sign" checkbox.
-- DONE It should also have Encrypt Lock icon next to "Encrypt" checkbox.
-- DONE On advanced menu, move P2P Transport from above Bazaar and below Settings.
-- DONE Move Bitcoin menu from main menu to Advanced Menu, above P2P Transport.
-- DONE Compose dialog should have a lock on it, to show that it is being encrypted. To the left of "To:"
-- DONE It should also have a signing hand on it, to show that it is being signed. To the left of "From:"
-- DONE Also on Sign/Encrypt dialog: If "Encrypt" checkbox IS ON, but there are no recipients, error out at the "Sign and Encrypt" button, saying no recipients are selected.

Signed-off-by: FellowTraveler <F3llowTraveler@gmail.com>