add filter for "abnormal" or "normal" or "all" annotations

Some of our phenotype sources record normality/abnormality of phenotypes... we want to be able to filter based on this flag.

Can you add this as a filter, that can be combined with any of the other filters?

In fact,for the first round, you could make that as part of the "basic filter" that all annotations should be of the 'abnormal' type.

I believe the col header in all cases ought to be phenotype_modifier.

Here's some examples where there's abnormality:

http://beta.neuinfo.org/mynif/search.php?q=*&t=indexable&nif=nif-0000-00096-6

http://beta.neuinfo.org/mynif/search.php?q=*&t=indexable&nif=nif-0000-00053-4

http://beta.neuinfo.org/mynif/search.php?q=*&t=indexable&nif=nif-0000-21427-10