fix help text when invoked with --help

the built-in optparser help text did not show the available commands

closes #304
restore 'electrum help command' usage
Merge pull request #312 from rofl0r/help-fix2

fix help text when invoked with --help
Merge pull request #311 from rofl0r/master

fix error to create a wallet due to missing pick_random_server decl
make it possible to create wallet non-interactively

add a --password option,
respect --server,--fee,--gap as passed on the command line,
and do not ask for them if they were specified.

so if all of them are passed, there are no interactive questions
asked and one can create wallets automatically via scripts.

closes #308

additionally it fixes the bug that the default fee and gap limit
were not stored in the new wallet, if entered manually.

additionally it fixes the bug that the wallet path was not displayed
correctly if a custom wallet path was used.
Merge pull request #315 from rofl0r/bug308d

make it possible to create wallet non-interactively
add experimental, fdisk-style console gui

the text gui doesnt work to well and when it crashes, it messes up
the state of the terminal.
advertise new text gui in the help screen
gui_stdio: fix tabs->spaces
Merge pull request #317 from rofl0r/stdio_gui

Stdio gui