Changed after LDAP DRAFT review carried on October 2013

This commit syncronizes the schema files with the
LDAP realisation document contents and with some choices in
the XML rendering.

Highlights are: Boolean SYNTAX type discarded in favour
of all DirectoryString types, all objects that are not
ABSTRACT in GFD.147 are turned into STRUCTURAL.

Some objects were incorrectly created as STRUCTURAL
and this has been changed.
Added SUP to some objects and made compile-schema.sh executable

SUP was missing in some object classes. This prevents creations of
LDAP objects that break inheritance.

The compile-schema.sh file was not executable.
Changed revision date
Changed all entities the inherit from Entity to be STRUCTURAL

This is to be in sync with the current realization document
Commit for version 2.0 that is in sync with the realisation document.

Includes just the version change.
Merge pull request #1 from floridop/EMIrevision

This is to sync with the latest version of the LDAP draft.