Shibboleth SP windows (msi) installer

[Rod Widdowson]

Please read no further if you have no interest in windows or the intricacies of building product releases...

The SP msi (windows installer package) suffers from a few drawbacks.  Notably it is not possible to use it to do an upgrade, further
an uninstall/reinstall is damaging to any IIS configuration (which is often a tricky part of the initial install).

At the same time, building the msi requires that a specific piece of commercial software is installed which limits which developers
can build a release.  Further the company responsible for the product in question has changed hands several times and as a result
the product feels unloved.

Finally, the installers for the windows version of IdP V3.x will be written using WiX (an Open Source MSI-building toolset) and we
would like it if everything used the same technology.

So, to cut a long story short, I have been researching and investigating WiX and the SP installer.  In order to clarify my notes I
have written up a brief requirements/design/implementation note at
https://wiki.shibboleth.net/confluence/display/~rdw@iay.org.uk/SPWiXDiscussionDesign

Anyone who is interested is encouraged to comment either here or in the Wiki.  In particular I'd appreciate feedback from those with
experience of WiX.

/Rod