re-add stdio guy

removed in 2c0814f0d38aa97f84623267fba9860d79c453ed
probably by mistake.
re-add text gui (ncurses)

removed in 2c0814f0d38aa97f84623267fba9860d79c453ed
probably by mistake.
Merge pull request #320 from rofl0r/readd_guis

Readd text and stdio guis
fix conversion in exchange rate plugin
network.set_server: test if server is the same
move network callbacks to init
rm dead code
key icon
fix imports
move lite window initialization in the constructor of the main window
support mBTC in lite gui
fix is_seeded
common wallet.restore() method for GUIs
fix import
add help text for csv
add input_info when transaction is created
sign_tx hook
fix labels plugin
set label
cleanup signrawtrasaction and input_info