Search shows new results without blanking results.

Much less jarring visually. Also small style tweaks adding a bit
more padding above and below the search "Titles/In Articles" buttons.

Change-Id: I1896e0139cd0b029f73329b432a4ee4b53212463
Limit recent search items to 100.

Since these are stored in a flat file we don't want to thrash if a
user did a bazillion searches without clearing their recent items.

Change-Id: Iec0f6585c8db160e3305402b240ed1c2aa3b4219
Merge "Limit recent search items to 100."