QuickMagic step3: fix check ages to display only sites that are actually part of the updated data
QuickMagic step3: possible (unimplemented) final clean up method added
QuickMagic force removal of all components of a folder when user selects delete (whether file or subfolder)
QuickMagic remove "pmag tables deleted" on_okButton message
QuickMagic step 3: fix propagation from er_sites to er_samples.  changes to site_type, site_lithology, and site_class now WILL propagate to sample_type, sample_lithology, and sample_class even if there was a previous value.  However, if you assign sample_b (with pre-existing sample_type) to site_2 (with a different site_type), sample_b will retain its initial sample_type
Merge branch 'menubar' of github.com:ltauxe/PmagPy into menubar