hoaparse: also accept LBTT input

This is probably the worse grammar I wrote: the LBTT format is designed
to be scanned with scanf, and very inconvenient to parse with
bison/flex.  Here the scanner basically has to emulate a parser to
classify the different INTs as tokens with different types.

* src/hoaparse/hoaparse.yy, src/hoaparse/hoascan.ll: Add rules for LBTT.
* src/hoaparse/parsedecl.hh: Add a way to reset the parser between each
automata.
* src/tgbatest/hoaparse.test, src/tgbatest/lbttparse.test: Add more
tests.

src/hoaparse/parsedecl.hh

@@ -32,6 +32,7 @@ YY_DECL;
 
 namespace spot
 {
+  void hoayyreset();
   int hoayyopen(const std::string& name);
   void hoayyclose();