log_in_out_control.tt: now supports var opt 'convert_hashpath=1'

The login/out control can now be included with a var option like this:

[% INCLUDE rapidapp/public/log_in_out_control.tt convert_hashpath=1 %]

Which will cause the current page to be added as a #!/ hashpath to the
login url. This effectively allows loading directly to the same
url/page that is active within a tab once the login completes