Deprecate %_mavendepmapdir and %_mavendepmapfragdir

These directories will be replaced my new metadata directory in XMvn
2.0.0.  The new directory is not supposed to be used by packager
directly, so it doesn't need a macro.
[todo] Remove all references to "depmap" from documentation
[todo] Include ivy-local in package diagram
Fix some typos in doc
[maven.req] improve error handling
[todo] Mention %mvn_artifact -D