bin: overhaul default input selection

If no input have been specified, and the standard input is not a tty all
tools now default to reading it.  If standard input is a tty, all tools
display an error message.  Additionally, - is now a shorthand for -F- in
all tools.

* NEWS: Summarize this.
* bin/common_finput.cc, bin/common_finput.hh (check_no_formulas,
check_no_automaton): New functions that implement the above istty()
logic.
* bin/autfilt.cc, bin/dstar2tgba.cc, bin/ltl2tgba.cc, bin/ltl2tgta.cc,
bin/ltlcross.cc, bin/ltldo.cc, bin/ltlgrind.cc: Use these function,
and recognize '-' if it was not the case.
* tests/core/acc_word.test, tests/core/ltldo.test,
tests/core/minusx.test, tests/core/readsave.test,
tests/core/unambig.test: Adjust some tests to exercise this.
* doc/org/autfilt.org, doc/org/csv.org, doc/org/dstar2tgba.org,
doc/org/ltl2tgba.org, doc/org/ltlcross.org, doc/org/ltlfilt.org,
doc/org/oaut.org: Adjust the documentation and simplify some
examples.

tests/core/acc_word.test

@@ -34,7 +34,7 @@ ltl2tgba -f 'a U b' |
 ltl2tgba -f 'a U b' | autfilt --accept-word='cycle{!b}' -q && exit 1
 
 # An example from the documentation:
-randltl -n -1 a b | ltlfilt --simplify --uniq | ltl2tgba -F- |
+randltl -n -1 a b | ltlfilt --simplify --uniq | ltl2tgba |
   autfilt --accept-word='a&!b;cycle{!a&!b}' --accept-word='!a&!b;cycle{a&b}' \
           --reject-word='cycle{b}' --stats=%M -n 3 > out
 cat >expect <<EOF

tests/core/ltldo.test

@@ -44,7 +44,7 @@ diff output expected
 
 # Test timeouts.  This test should take 2*2 seconds.
 $genltl --or-g=1..2 |
-run 0 $ltldo -F- -t 'sleep 10; echo %f' -T1 -t 'sleep 10; echo %f' \
+run 0 $ltldo -t 'sleep 10; echo %f' -T1 -t 'sleep 10; echo %f' \
 	     >output 2>stderr
 test -z "`cat output`"
 test 4 = `grep -c warning: stderr`

tests/core/minusx.test

@@ -22,7 +22,7 @@
 set -e
 
 # make sure option -x reports unknown arguments
-ltl2tgba -F- -x foo </dev/null 2>error && exit 1
+ltl2tgba - -x foo </dev/null 2>error && exit 1
 grep "ltl2tgba: option 'foo' was not used" error
 ltl2tgba -F- -x ba-simul,foo,bar </dev/null 2>error && exit 1
 grep -v 'ba-simul' error

tests/core/readsave.test

@@ -115,9 +115,8 @@ diff stdout stdout2
 # exercise both %M and %m.  The nonexistant file should never be
 # open, because the input stream is infinite and autfilt should
 # stop after 10 automata.
-randltl -n -1 a b |
-    ltl2tgba -H -F - |
-    autfilt -F- -F nonexistant --states=3 --edges=..10 --acc-sets=1.. \
+randltl -n -1 a b | ltl2tgba |
+    autfilt -F - -F nonexistant --states=3 --edges=..10 --acc-sets=1.. \
 	     --name='%M, %S states' --stats='<%m>, %e, %a' -n 10 > output
 cat >expected <<EOF
 <F(b | Ga), 3 states>, 5, 1
@@ -278,7 +277,7 @@ autfilt --merge -Hm input --name="%E->%e edges, %T->%t transitions" > output
 diff output expected
 
 
-cat <<EOF | ltl2tgba -x degen-lskip=1 -F- --ba -H > tmp.hoa
+ltl2tgba -x degen-lskip=1 --ba > tmp.hoa <<EOF
 a U b
 false
 !b && Xb && GFa

tests/core/unambig.test

@@ -152,7 +152,7 @@ run 0 $autfilt --check input > output
 test `grep -c unambiguous output` = 0
 
 # Check 1000 random PSL formulas
-randltl --psl -n 1000 3 | $ltl2tgba -U -F- -H |
+randltl --psl -n 1000 3 | $ltl2tgba -U -H |
   $autfilt -v --is-unamb --stats=%M && exit 1
 
 cat >input <<EOF