The "basename" here needs to be the full path without the trailing
extension, instead of stripping the leading path as well.
This was previously fixed in 2f36efa087 inside the view, but the
problematic code was still present in FoundBlob, and the corresponding
spec didn't actually use a child wiki page to properly verify the fix.
* removed 100 limit on file search results because we
load all results anyway
* expensive processing (parsing match content, utf encoding)
is done only for selected page in paginated output
