Bump version to 1.99b to celebrate support for generic acceptance

* configure.ac: Bump version.
* NEWS: Update description of HOA support.

NEWS

@@ -1,4 +1,4 @@
-New in spot 1.99a (not yet released)
+New in spot 1.99b (not yet released)
 
   * Major changes (including backward incompatible changes):
 
@@ -70,17 +70,17 @@ New in spot 1.99a (not yet released)
       order to do batch processing.  This format can be output by all
       tools (since Spot 1.2.5) using the --hoa option, and it can be
       read by autfilt (by default) and ltlcross (using the %H
-      specifier).   The current implementation does not support:
-        - acceptance specifications involving "Fin(x)", "|", or "f".
-	- alternation
-      but the rest is expected to work.  Those restrictions cause the
-      automaton to be interpretable as a TGBA.  In particular,
-      multiple initial states are converted into an extra initial
-      state; complemented acceptance sets Inf(!x) are converted to
-      Inf(x); negated (maybe after duplication); explicit or implicit
-      labels can be used; aliases are supported; "--ABORT--" can be
-      used in a stream.  The parser currently ignore all optional
-      headers (starting with a lowercase letter).
+      specifier).  The current implementation does not support
+      alternation.  Multiple initial states are converted into an
+      extra initial state; complemented acceptance sets Inf(!x) are
+      converted to Inf(x); negated (maybe after duplication); explicit
+      or implicit labels can be used; aliases are supported;
+      "--ABORT--" can be used in a stream.
+
+      Note that not all algorithms in the library will work with any
+      acceptance conditions.  Automata with acceptance conditions that
+      involve Fin acceptance can be couverted to not use Fin when that
+      is a problem.
 
     - The above HOA parser can also parse never claims, and LBTT
       automata, so the never claim parser and the LBTT parser have