created sansyo_t
added operator-> to sansyo_t
added is_null() to sansyo_t
changed pointers to sansyo_t
Merge branch 'master' into sansyo-count
added delete_kankyo/data
added deletion of sansyo<=0 objects to sansyo_t (not working well)
make sansyo_t use increment/decrement_sansyo_count
attempt to make deletion using sansyo_count (not working well)
added debug*.txt
fixed possible double-deleting on last object deletion
changed Makefile from debug to do optimization