- update to 0.1.20:
* src/tree.c (makeInline): Inline nodes remember their parent
rule.
* Replace "$$" in inline actions with "__".
* src/tree.h (struct Inline): Inline nodes remember their
parent rule.
* (main): Don't print #line directives for headers if
nolineFlag is set.
* src/compile.c (allocateVariables): Separated from
defineVariables.
* (Node_compile_c_ko): Allocates and sets local variables
during parse.
* (Rule_compile_c2): Generate yyEnter and yyLeave if rule has
variables.
* (preamble): Macros yyEnter and yyLeave manage local variable
space on stack during parsing.
* src/compile.c: Allow re-entrant parsing.
* Macro YYPARSEFROM_R names the function yyparsefrom_r().
* yyDone takes second argument, the yythunkpos at which actions
start.
* yyparsefrom_r saves and restores thunkpos and val state
during recursive parse.
* yyparsefrom resets thunkpos, val before recursive parse.

- Update to 0.1.18: