fix issue #348
New app icons

.icns for Mac have been tested and carries all sizes needed even for
Retina displays.

.ico should work well, but the build process for making Windows builds
is broken for me, so it need to be tested with binaries.

.png replaced witht the latest version
Merge pull request #349 from rdymac/icons

New app icons
remove -b option for listaddresses (fix issue #343)
create a subdirectory for wallets, under default path
move old wallet to subdir
seed v6
seed prefix 01
disable bip32
fixes: get_seed
fix mnemonic decode
exit after seed message
no keyid for imported keys
release notes: bip32 featues are postponed
minor fix: restore from hexadecimal seed
fix deseed
fix: offline signing
offline signing with seed_v4
Fixes qrscanner to 1.9 API.
Adds a settings dialog for qrscanner plugin - allows device selection