g_hash_table_new_full(): create hash tables with a ref count of 1.

g_hash_table_new_full(): create hash tables with a ref count of 1.

Tue Nov 22 14:04:26 2005  Tim Janik  <timj@imendio.com>

        * glib/ghash.h:
        * glib/ghash.c:
        g_hash_table_new_full(): create hash tables with a ref count of 1.
        g_hash_table_ref(): atomically ref_count+=1
        g_hash_table_unref(): atomically ref_count-=1, destroys hash table
        when refcount reaches 0.
        g_hash_table_destroy(): just destroy keys and values, unref by 1.
        g_hash_table_insert():
        g_hash_table_replace(): assert ref_count>0.

        * glib/gatomic.h:
        * glib/gatomic.c: added 'volatile' qualifier to all atomic pointer and
        integer pointers.