[MSITE-1036] support shared source directory instead of format-specific ones

[jira-importer]

Hervé Boutemy opened MSITE-1036 and commented

src/site/<format>/ source content *.<extension>
makes it hard to maintain content in a directory with multiple formats

supporting src/site/source content *.<extension>
could ease maintenance

we need to define what to do with site.xml
or when multiple formats share same extension

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Issue Links:

• DOXIASITETOOLS-363 support shared directory for multiple markup formats
  ("requires")

[jira-importer]

Michael Osipov commented

This needs to handled in Doxia Sitetools first...