Indices - segregate MPD/MNTD

[GoogleCodeExporter]

The MPD and MNTD indices are calculated using a single calc.  Often, however, 
users will only want one or the other.  The same goes for the NRI/NTI calcs.  

There will be speed gains if the MPD/NRI and MNTD/NTI calcs were separate.  
They can still depend on the same underlying subs, but set global flags when 
each variant is needed using a pre_calc_global sub.  The inner subs can then 
depend on these global flags.  

Original issue reported on code.google.com by shawnlaffan on 27 Jun 2014 at 3:59

[GoogleCodeExporter]

This issue was updated by revision r2533.

Add branch to work on the issue

Original comment by shawnlaffan on 28 Jun 2014 at 7:00

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[GoogleCodeExporter]

This issue was updated by revision r2534.

Add some small code changes.  
Add formulae for mpd/mntd

Original comment by shawnlaffan on 28 Jun 2014 at 7:02

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[GoogleCodeExporter]

This issue was updated by revision r3100.

Merge revisions so far across to the trunk.  

Original comment by shawnlaffan on 4 Dec 2014 at 12:44

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[GoogleCodeExporter]

This issue was updated by revision r3101.

Delete branch since we have merged it across and SVN has tree conflicts once 
that is done.  
A new branch can be created when work recommences.  

Original comment by shawnlaffan on 4 Dec 2014 at 12:46

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