Add osl_int_sscanf function
Add osl_int_init_set function
Add extensions/loop.h and extensions/pluto_unroll.h in osl.h
Add osl_strings_add function
Update osl_generic_lookup function
Add osl_statement_get_body function
Merge pull request #19 from Lnc/osl_int_optimize

Add osl_int_init_set and osl_int_sscanf function
Minor correction in osl_relation_remove_column()
Return type of osl_relation_list_count function is size_t
Return type of osl_scop_number function is size_t