Merge pull request #20 from l1ll1/CVLFAB-545-two-part-ui

Cvlfab 545 two part ui
Removed some unused rubbish from helpfiles directory.
First stab at hosting Launcher's help content on a remote server.

I thought wx.html.HtmlHelpController's AddBook method was
supposed to be able to accept a zip file, but I couldn't
get that to work on Mac OS X (not sure about other OS's),
so I am unzipping the ZIP archive to a temp directory.

Haven't implemented clean-up yet, i.e. multiple runs of
the Launcher could result in multiple copies of its help
files being stored on the user's local machine.
Adding README.txt to help subdirectory.
Bundling of help content resources, even though the preferred
method of displaying help content will be retrieving it from
a remote server, e.g. GitHub.  The bundled help resource files
can be used as a fallback if the remote server can't be
reached.
Starting to encapsulate help-related functionality into a class.
Help functionality has now been encapsulated in a class within
a module.  No more global helpController variables.
Adding ssh utils submodule.
testing update to cvlsshutils submodule
Added contents of sshHelpText.txt to new HTML help page,
called "Authentication Overview".
Fiddling with layout of help content.
Help buttons on Chris's sshkeyDist dialogs now open HTML help,
which is nice, but unfortunately, the user can't scroll down
on the HTML help window while the Launcher is displaying a
modal dialog.  The user can Cancel from the modal dialog and
then scroll down to read the rest of the help.  Perhaps instead
of using app-modal dialogs, we should be using locally modal
dialogs, e.g. http://wiki.wxpython.org/ParentModalDialog
...
Adding some keywords to Index and linking them to anchors
within help pages.
Merge branch 'CVLFAB-545-two-part-ui' of https://github.com/CVL-dev/cvl-fabric-launcher into CVLFAB-545-two-part-ui
Merge branch 'CVLFAB-545-two-part-ui' of https://github.com/CVL-dev/cvl-fabric-launcher into CVLFAB-545-two-part-ui
Migrated sshKeyDist to the cvl-ssh-utils repo
changing other occurrences of sshKeyDist to cvlsshutils.sshKeyDist
Merge branch 'CVLFAB-545-two-part-ui' of github.com:CVL-dev/cvl-fabric-launcher into CVLFAB-545-two-part-ui
Fix imports of certain ssh dialogs