rename ltlcheck as ltlcross

* src/bin/ltlcheck.cc, src/bin/man/ltlcheck.x,
src/tgbatest/ltlcheck.test, src/tgbatest/ltlcheck2.test: Rename as ...
* src/bin/ltlcross.cc, src/bin/man/ltlcross.x,
src/tgbatest/ltlcross.test, src/tgbatest/ltlcross2.test: ... these.
* NEWS, src/bin/Makefile.am, src/bin/man/Makefile.am,
src/tgbatest/Makefile.am: Adjust.

src/bin/man/ltlcross.x

@@ -0,0 +1,60 @@
+[NAME]
+ltlcross \- cross-compare LTL/PSL translators to Büchi automata
+[DESCRIPTION]
+.\" Add any additional description here
+[EXAMPLES]
+The following commands compare never claims produced by ltl2tgba(1)
+and spin(1) and 100 random formulas, using a timeout of 2 minutes.  A
+trace of the execution of the two tools, including any potential issue
+detected, is reported on standard error, while statistics are
+written to \f(CWresults.json\fR.
+
+.nf
+% randltl \-n100 \-\-tree\-size=20..30 a b c | \e
+ltlcross \-T120 'ltl2tgba \-s %f >%N' 'spin \-f %s >%N' \-\-json=results.json
+.fi
+.LP
+
+The next command compare lbt, ltl3ba, and ltl2tgba(1) on a set of
+formulas saved in file \f(CWinput.ltl\fR.  Statistics are again writen
+as CSV into \f(CWresults.csv\fR.  Note the use of \f(CW%L\fR to
+indicate that the formula passed to lbt should be written into a file
+in LBT's format, and \f(CW%T\fR to read the output in LBTT's format
+(which is a superset of the format output by LBT).
+
+.nf
+% ltlcross \-F input.ltl \-\-csv=results.csv \e
+           'lbt <%L >%T' \e
+           'ltl3ba \-f %s >%N' \e
+           'ltl2tgba \-\-lbtt %f >%T'
+.fi
+.LP
+
+If you use ltlcross in an automated testsuite just to check for
+potential problems, avoid the \fB\-\-csv\fR and \fB\-\-json\fR
+options: ltlcross is faster when it does not have to compute these
+statistics.
+
+[SEE ALSO]
+.BR randltl (1),
+.BR genltl (1),
+.BR ltlfilt (1),
+.BR ltl2tgba (1)
+
+[BIBLIOGRAPHY]
+ltlcross is a Spot-based reimplementation of a tool called LBTT.  LBTT
+was developped by Heikki Tauriainen at the Helsinki University of
+Technology.  The main motivation for the reimplementation was to
+support PSL, and output more statistics about the translations.
+
+The sanity checks performed on the result of each translator (by
+either LBTT or ltlcross) are described in the following paper.  Our
+implementation will detect and reports problems (like inconsistencies
+between two translations) but unlike LBTT it does not offer an
+interactive mode to investigate such problems.
+
+.TP
+th02
+H. Tauriainen and K. Heljanko: Testing LTL formula translation into
+Büchi automata.  Int. J. on Software Tools for Technology Transfer.
+Volume 4, number 1, October 2002.