bin: add shorthands for ltl2dpa ltl2da and ltl2ldba

* bin/common_trans.cc: Here.
* doc/org/ltlcross.org, doc/org/ltldo.org, NEWS: Adjust.

NEWS

 New in spot 2.3.2.dev (not yet released)
 
+  Tools:
+
+  - ltldo and ltlcross learned shorthands to talk to ltl2da, ltl2dpa,
+    and ltl2ldba (from Owl) without needing to specify %f>%O.
+
   Bug fixes:
 
   - In "lenient" mode the parser would fail to recover from

bin/common_trans.cc

@@ -43,6 +43,9 @@ static struct shorthands_t
   shorthands[] = {
     { "lbt", " <%L>%O" },
     { "ltl2ba", " -f %s>%O" },
+    { "ltl2da", " %f>%O" },
+    { "ltl2dpa", " %f>%O" },
+    { "ltl2ldba", " %f>%O" },
     { "ltl2dstar", " --output-format=hoa %[MW]L %O"},
     { "ltl2tgba", " -H %f>%O" },
     { "ltl3ba", " -f %s>%O" },

doc/org/ltlcross.org

@@ -182,6 +182,9 @@ the following words, then the string on the right is appended.
 
   lbt          <%L>%O
   ltl2ba       -f %s>%O
+  ltl2da       %f>%O
+  ltl2dpa      %f>%O
+  ltl2ldba     %f>%O
   ltl2dstar    --output-format=hoa %[MW]L %O
   ltl2tgba     -H %f>%O
   ltl3ba       -f %s>%O

doc/org/ltldo.org

@@ -309,6 +309,9 @@ the following words, then the string on the right is appended.
 
   lbt          <%L>%O
   ltl2ba       -f %s>%O
+  ltl2da       %f>%O
+  ltl2dpa      %f>%O
+  ltl2ldba     %f>%O
   ltl2dstar    --output-format=hoa %[MW]L %O
   ltl2tgba     -H %f>%O
   ltl3ba       -f %s>%O