Improve links between directives in documentation

[Christophe JAILLET <ch...@wanadoo.fr>]

Hi,

I've updated common.xsl in order to warn when xml files could be 
slightly improved. (see r1869016)

It checks (and removes) some unneeded links to some directives and warns 
about missing ones.

Feedback welcome.


My goal is to try to completely remove the need of @module in 
<directive> and have the xls generates the links as needed automagically.
If s.o. has pointers to achieve this, it would also be appreciated.

CJ


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