This helps to catch upgrade problems and simplifies some parts of the code.
Bumped XBPS_RELVER because xbps_remove_pkg() has been changed.
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extra : convert_revision : xtraeme%40gmail.com-20100128150850-gcs93su38t6moydn
doxygen and graphviz are required. It's disabled by default, use
the BUILD_API_DOCS make(1) argument to enable it.
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extra : convert_revision : xtraeme%40gmail.com-20100123013719-pkk3a3823cx09v8l