For #189.
* NEWS: Update.
* bin/autfilt.cc: Replace stopwatch with process_timer.
* bin/dstar2tgba.cc: Replace stopwatch with process_timer.
* bin/ltl2tgba.cc: Replace stopwatch with process_timer.
* bin/ltlcross.cc: Replace stopwatch with process_timer.
* bin/ltldo.cc: Replace stopwatch with process_timer.
* bin/randaut.cc: Replace stopwatch with process_timer.
* bin/common_aoutput.hh: Implement process_timer, integrate it.
* bin/common_aoutput.cc: Integrate process_timer and implement new
print method.
* spot/misc/timer.hh: Modify timer class and timeinfo struct
i.e. add cutime (children_utime) and cstime (children_stime).
* spot/misc/timer.cc: Help code to behave as before all this.
* spot/twaalgos/dtbasat.cc: Help print_log to behave as before
all this.
* spot/twaalgos/dtwasat.cc: Help print_log to behave as before
all this.
* spot/misc/formater.hh: Add operator<< for spot::timer.
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.
* bin/common_aoutput.hh, bin/common_aoutput.cc,
bin/ltl2tgba.cc, bin/ltldo.cc: Add support for %< and %>.
* tests/core/ltl2tgba.test, tests/core/ltldo.test: Test it.
* NEWS: Mention it.
