separated logout into separate macro
separated logout into separate macro

using POST rather than GET

used a BUTTON rather than an INPUT element for styling reasons; IE is
not very good at styling submit buttons

code adapted from jdlrobson

TiddlySpace/tiddlyspace,FND/tiddlyspace,FND/tiddlyspace,FND/tiddlyspace,TiddlySpace/tiddlyspace,TiddlySpace/tiddlyspace