Failing test for gh-3334
Use new input transformation API in %%time

This avoids the perils of 'multiline specials', where valid Python syntax
unexpectedly gets turned into IPython magic commands.

Closes gh-3334
fix default cluster count
fix test_find_cmd_python

It's a bit unclear what should be done here.
'python' is short-circuited in find_cmd to sys.executable.
This commit does the same short-circuit with basename(sys.executable), which can be any of Python, python, python3, python3.exe, etc.

An alternate fix would be to change the test back to testing what the code actually did.
remove special case for 'python' in find_cmd
Reorg of the js/less/css files.
More renaming of less files.
Renaming.
Working on cleaning up our less files.
Moving files inside js folder.
Moving js files into subdirs.
More movign around of things in notebook and js/less.
Changes to templates.
Moving js/less/css dirs up one level. Too much nesting.
More work on the less setup.
Cleaning up less/css.
Wrok on static/tree
Adding link to new location of favicon.ico.
Putting custom.css/custom.js in static/user.
Renaming main JS files.