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Moving pv version info to a seperate cmake file.
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The version information is updated with each new PV release. It is best
if this was in a seperate file.

We add another variable called pv_version_long which is the long suffix
version. This varialble will be used to name directories tarballs of
various plugins.

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Including paraview_version in the top level.
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This pv_version_information is make accessible at the top level. This
will enable various plugin to name their tarballs using this information.

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Modifying all plugins to have versioned suffix + directory
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There is no mechanism to differntiate plugin builds to the ParaView
version they build agains...