Create MySQL Cluster user documentation from source code

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(All these require Doxygen.)

* make clean

Remove all generated documentation and tmp files

* make ndbapidoc

Makes the NDB API Programmer's Guide (in HTML)

* make ndbapipdf

Makes the NDB API Programmer Guide (in PDF)

* make mgmapidoc

Makes the MGM API Reference Manual (in HTML)

* make mgmapipdf

Makes the MGM API Reference Manual (in PDF)

* make ndbdoc

Makes source code browser for NDB Cluster (in HTML)

(Requires Graphviz.)

Doxygen and Graphviz can be found at:

http://www.doxygen.org

or at (for Red Hat 9.0 RPMs):

http://dentrassi.de/download/doxygen/

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