add more env slots

TODO.FACTOR.txt

@@ -5,12 +5,15 @@
 - slice: if sequence or seq start is changed, abstraction violation
 - code walker & exceptions
 - floating point intrinsics
+- load all sources in stage1
+- new basic block optimizer
 - fix fixnum/mod overflow on PowerPC
 - intrinsic char-slot set-char-slot
 - split: return vectors
 - set-path: iterative
 - investigate if rehashing on startup is really necessary
 - remove word transfer hack in bootstrap
+- swap @{ }@ and { } syntax
 
 + ui:
 

native/run.h

@@ -1,4 +1,4 @@
-#define USER_ENV 16
+#define USER_ENV 32
 
 #define CARD_OFF_ENV   1 /* for compiling set-slot */
 /* 2 is unused */