fixed issue with delete failing from open tails

pre-emptively closes tails and watches so that the deletion of
awd,bwd,cwd doesn't throw an exception and close the webui.
updated sample commands for webui
prevents 'create' if servername already in use
WORKAROUND: issue when tracking new server

upon creating new server with global.emit, it does not seem to be
tracked/initialized properly in channels[], client-side.

this workaround forces a full server_list reset, which is a working
model, but not ideal.