Add groupings for side tables

[kmcluskey]

All of the side tables list metabolites or peaks but it would be useful to have a link through to a collection of them all - as a user I would find that more beneficial.

[kmcluskey]

This has been done from the Met_Explorer to give a list of peaks - from that list of peaks there should be a link to the compare_peaks for that group of peaks..
Half done..

[kmcluskey]

This is now done for all tissues and the nav link to the compare and mf compare pages all update to the filtered peaks.
This really should now all be done for the Age data pages - again this is why the ODR pages are better :(