Make the "compile module" code actually return, rather than call

	Make the "compile module" code actually return, rather than call
	exit().  This means that we have a "stack" of errors to print if
	something goes wrong, so we can track what referred to the item
	making the problem.

	Allow redundant{} etc. sections to have second names,
	and use those names for printing.

	Allow subsections in "instantiate", and use those subsections
	as "virtual" modules, so that you don't have to copy blocks
	of text, if the same kind of redundancy/fail-over is done in
	multiple places.

	This fixes bug #181

	These subsections will later allow us to use the subsection names
	in xlat's.  e.g.

	redundant magic_ldap {
		ldap1
		ldap2
	}

	... %{magic_ldap: query...}, which will fail-over from ldap1 to ldap2