Add optimize_full pseudo feature.

Cargo.toml

@@ -19,7 +19,7 @@ num-traits = "*"
 
 [features]
 #default = ["no_function", "no_index", "no_float", "only_i32", "no_stdlib", "unchecked", "no_optimize"]
-default = []
+default = [ "optimize_full" ]
 debug_msgs = []     # print debug messages on function registrations and calls
 unchecked = []      # unchecked arithmetic
 no_stdlib = []      # no standard library of utility functions
@@ -27,6 +27,7 @@ no_index = []       # no arrays and indexing
 no_float = []       # no floating-point
 no_function = []    # no script-defined functions
 no_optimize = []    # no script optimizer
+optimize_full = []  # set optimization level to Full (default is Simple)
 only_i32 = []       # set INT=i32 (useful for 32-bit systems)
 only_i64 = []       # set INT=i64 (default) and disable support for all other integer types