Changes to docs & web resources

md2html builds html using pandoc on PC so Brad can update user guide
directly.

Removed user guide pdf creation, no longer maintaining this.

User guide html can be opened from inno setup or GUI. Added query string
to track request origin and release number.

User guide html uses images from github.com, just need to upload html
when changes.

removed fancy square root formatting- love it but unfortunately it was
causing pandoc problems.

Version now set at top of iss scripts as a variable.
Fix error in iss file