Keep aliases and disguised_structures local to each module (#560419)

Keep aliases and disguised_structures local to each module (#560419)

When parsing, keep keep a separate hash tables of aliases and
'disguised' flags for each module, and store that on the module.

After parsing an include merge the aliases/disguised flags to the
including module.

Remove 'prefix_aliases' flag and always prefix aliases/disguised
structure types when parsing; this simplifies the code considerably.

svn path=/trunk/; revision=904