search and filter UI clunkiness

[gubuntu]

• Don't reload the whole page when clicking on 'show more ISO topic categories'.
• search with a search term, then delete it and apply a filter and the search term reappears. It should remain deleted so the search is not reapplied. #372
• Make UI searches match CSW searches, which they are not currently doing (see Update testing env to include pycsw integration #175 (comment))

[ThiashaV]

The whole page does not reload when selecting 'show more ISO topic categories'.

After clearing the search bar when searching with a search term and then applying a filter, the search term does not reappear nor is it reapplied.

[ThiashaV]

"Make UI searches match CSW searches, which they are not currently doing (see #175 (comment))" is not ready to be tested yet

[Jeremy-Prior]

UI searches return additional results compared to the CSW search. Used MetaSearch in QGIS as the CSW test.

The final part of this ticket relies on issue #175 to be completed.

[gubuntu]

@MarinaKartoza this should not have been closed since the last item is not done. If you want to close this, pull out the last item into a new issue and cross reference