Removed text from m.mixed.basic.plus

Redundant - text is inherited from m.mixed.basic.
Removed text from m.mixed.basic.plus.access

Redundant - text is inherited from m.mixed.basic.
Updated m.para.content

Consolidated m.mixed.basic.plus and m.access into just
m.mixed.basics.plus.access.
Simplified <p> content model

Eliminated choice and text - both were already part of m.para.content.
Added ref to av.yesorno to @approximate

Simplifies things a bit since av.yesorno is an existing model.
Restored a.access.no.normal

Found that a.access.no.normal could be used on term, unittype, and
phyfacet, consolidating where the source/identifer/rules set by
declaring it once.
Removed redundant choice around av.level
Removed redundant choice around am.simplelink
Removed redundant choice around av.render
Added missing optional for agencycode/@localtype
Add missing optional in otheragencycode/localtype
Removed redundant optional
Removed redundant zeroOrMore
Reordered a.common and a.localtype

On controlaccess
Consolidated controlaccess localtypes to ref
Removed redundant choice
Removed redundant <choice>
Removed redundant choice
Removed redundant <choice>
Moved optional for @localtype to a.localtype