I have moved mds from the analysis module to a separate dimred module
as I think it is best to keep this with the other dimensionality
reduction algorithms.  It is now default off though

The old analysis class was reaching a stage where it was not fit
for purpose.  This is thus a total redesign in order to allow us
to write better algorithms for dimensionality reduction that are
flexible and easy for users to use.  I have removed some functionality
with this commit but I will re add it in subsequent commits
Also added information on analysis classes to developer documentation

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Conflicts:
	user-doc/bibliography.bib

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closes #147

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Conflicts:
	VERSION

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closes #141

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Before fix the master branch was installed
Now we explicitly ask for 1.69

Now $HOME/opt has the priority. This allows properly
overriding already installed programs.

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Conflicts:
	VERSION

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I merge the STRETCH/NOSTRETCH change in switching functions.
This only applies to advanced syntax ({RATIONAL ....})

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