Fix ngscuda build

little docu polish

update Netgen, memcpy check for num=0

Create H1HOProlongation already in H1 ctor

matfree tangentialfacet - tangentialcomponent

I tut christoph

See merge request ngsolve/ngsolve!1327

parallel diagonal assembling

lambda capture

update netgen for ngtcl

Update Netgen, fix netgen version in pip packages