Moved add command to a safeword lib function safeword_credential_add().
Base implementation of copy command; parsed commandline and executes stub callback.
Implemented X11 copy/paste feature; waits on separate thread for the specified amount of time.
Added cp command to supported commands.
Added cp command to bash completion script.
Fixed bug where incorrect SQL selected wrong password.
Moved cp command to a safeword lib function safeword_cp_password().
cp command no longer forks; also the X11 window waiting for selection requests is hidden now.
Implemented -u and -p options to allow specific fields to be pasted from clipboard.