New inset for \nopagebreak

[Pavel Sanda]

Hi,

I am tired of writing \nopagebreak into ERT so my graphics ends up with the
description above on the same page (these are reports so float environment are
not suitable).

Is there any objection to add this as a new inset?

Implementation-wise it could be just variant of page-break inset when you look
at the semantics, painting-wise it would belong to the newline inset. Or it
could be completely standalone inset. The semantic version seem most appropriate
to me. Opinions?

Pavel