modernize innreport HTML

[Julien ÉLIE]

Hi Richard,

> The current design is broken when served over HTTPS or when the 
> webserver has a content security policy. The attached patch fixes both 
> issues.

Here are the 2 patches I've come up with, following your initial 
suggestion and subsequent discussions in the mailing-list:

   https://inn.eyrie.org/trac/changeset/10368 (remove W3C links)
   https://inn.eyrie.org/trac/changeset/10374 (CSS externalization)

I've notably added a comment, for future references, to keep old CSS 
definitions for backward compatibility with previously generated reports 
(in case we change HTML structure or style names in future versions).
Also, automatic generation of innreport.css does not occur if the user 
has a specific CSS of the same name (he would otherwise loose it).


Besides, I suggest a change in innreport version numbers.  It has been 
"innreport 3.1.0" for a long time, even though modifications were 
carried.  A wording like "innreport from INN 2.6.4" (incrementing with a 
new release) makes it clearer:

   https://inn.eyrie.org/trac/changeset/10371


If you have any comment, do not hesitate to tell.
I'll commit these patches in a few days to the stable branch (for INN 
2.6.4) if that's OK for everyone.

-- 
Julien ÉLIE

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