release: 1.3.60

release: 1.3.60

===========

* Removed String_identifier, and use the type system of GUILE instead.

* Fixed \key PITCH MODALITY syntax. The modality argument is now
mandatory, a rule in convert-mudela has been added.

* Cleaned up  buildscripts/ directory: removed obsolete scripts.

* Use Scheme_hash_table for identifier Scopes.  Scheme_hash_table is
based on STL and should be faster than hash_table.

1.3.59.j