Render XInclide failures, small changes on configure.php and translation qaxml sync tools

[alfsb]

• On configure.php: Code reorganization, more detailed messages and links in output.
• On qaxml tools: Spelling in comments, documentation and filenames.

Most of the changes are cosmetic or internal, as the final touches before removing the 1st generation of QA sync tools, and to making configure.php a little less "everything in global" usage. The more visible changes are:

• Included another class of automatic XInclude fixup so doc-pl now builds.
• Also make most of XInclude failures visible om rendered manuals, with the message [Failed XInclude 'internal.target'].

[alfsb]

The plan is to merge this in few weeks, and after starting a very grunt work of rewriting $argvparsing and checking to be more centralized and function driven instead the two AC global arrays, multiple case/spelling of options, and the "string typed" aspect of code, while removing documented but inexistent or decade long broken options.

[alfsb]

The proposed change, of making XInclude failures will render somenting like this:

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