Add investigation number field to search form

[mantid-builder]

Original Reporter: Jay Rainey

Owen noted that:

"Scientists would like to search using investigation numbers".

To do this, I will need to:

1. Add a new form element in CatalogSearch.ui
2. Update getSearchFields method in CatalogSearch.cpp to account for new form element.
3. Add a related getter/setter method to CatalogSearchParam.
4. Add new property to CatalogSearch algorithm.
5. Add new check to buildSearchQuery in ICat4Catalog.
6. Update ICat3Catalog to also work accordingly.

As users want to search using investigation Number, it may also be worth while showing it in the investigation table results. (Currently it's hidden for usability purposes, but if it's useful for scientists it would be worthwhile showing it).

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Keywords: ICAT

[mantid-builder]

This issue was originally trac ticket 8757