Add index entries to the Mapserver Documentation

[havatv]

Since the index is linked from the Mapserver "front" page, it would be good if it was more useful. All mapfile parameters should have index entries, normally as pairs.

Index entries are added using the following Sphinx markup:

.. index::
   single: expressions

Something about expressions...

.. index::
   pair: map; metadata

Something about map metadata...

.. index::
   triple: map; style; symbol

Something about map, style and symbol...

[havatv]

Index entries has been added for mapfile parameters, mapscript, installation and OGC services in a number of commits.

[havatv]

Added indexes to the cgi controls document in r12524.

[havatv]

Added indexes to the raster input document in r12540.

[havatv]

Added some index entries to the ogc filter encoding document in r12558.

[havatv]

Added some index entries to the errors document for 6.0 and trunk in r12596.

[havatv]

Added more indexes to the layer document for 6.0 and trunk in r12945.

[havatv]

Added indexes to the join, label, map, outputformat, scalebar, style and symbol documents in trunk and 6.0 in r12946.

[havatv]

Forgot join in the previous commit - added in r12947.

[havatv]

Added two index entries (Temporary files, Temporary path) to the web document in r12978.

[havatv]

Added index entries to mapfile/index in r13015.

[havatv]

Added index entries for the utilities in r13018.

[havatv]

Added index entries for WMS, WFS, WCS and SOS metadata elements in r13234. For WMS, only in trunk.