review the delete code, mostly clean up indentation; but also null out pointers to deleted areas after deletion.
review the delete code, mostly clean up indentation;
but also null out pointers to deleted areas after deletion.


git-svn-id: fc35eccb03ccef1c432fd0fcf5295fcceaca86a6@23083 bcba8976-2d24-0410-9c9c-aab3bd5fdfd6

linas/link-grammar,MadBomber/link-grammar,MadBomber/link-grammar,opencog/link-grammar,linas/link-grammar,ampli/link-grammar,linas/link-grammar,opencog/link-grammar,ampli/link-grammar,opencog/link-grammar,ampli/link-grammar,ampli/link-grammar,opencog/link-grammar,linas/link-grammar,linas/link-grammar,MadBomber/link-grammar,linas/link-grammar,opencog/link-grammar,opencog/link-grammar,MadBomber/link-grammar,MadBomber/link-grammar,ampli/link-grammar,ampli/link-grammar,ampli/link-grammar,opencog/link-grammar,linas/link-grammar,opencog/link-grammar,opencog/link-grammar,MadBomber/link-grammar,ampli/link-grammar,ampli/link-grammar,linas/link-grammar,linas/link-grammar,MadBomber/link-grammar,MadBomber/link-grammar