--no-search-headers for header lines only

[joknarf]

using option :
--no-search-headers
Don't search in header lines or columns.
is perfect to keep header line when doing &pattern, as the header line remains visible

But I think we should have a way to only discard search in header lines.
I need to search/filter on header columns but not on header lines.

[gwsw]

Added --no-search-header-lines and --no-search-header-columns in 6e9f84a.