latlon: "use warnings" + remove -w from shebang

53ccfdc2-3d1f-11e4-8025-c80aa9e67bbd
roundgpx: "use warnings" + remove -w from shebang

804dd16e-3d1f-11e4-9345-c80aa9e67bbd
Use "#!/usr/bin/env perl" in all Perl scripts

1b3b7e42-3d20-11e4-9613-c80aa9e67bbd
Remove "grep -v '^ok ' from all Makefiles under tests/

All tests should pass, so if anything fails, abort after execution of
that particular test script.

3f166176-3d41-11e4-9e6f-c80aa9e67bbd
.gitignore: Ignore tests/*.tmp

d78570be-3d32-11e4-99e5-c80aa9e67bbd