Usability polish:
- if the user has used the Advanced Search window, but has effectively only used the keywords field, recognize the search (by checking the XML) as a keyword search and treat it as such.
Only if the advanced search options have actually been used, mark it as AdvancedSearch

- if an advanced search is the current search, display this text in the line edit for entering a keyword search.
The user can still click the line edit, in which case the text disappears, and create a new keyword search, but he is warned to better use the advanced search button.