Fixed serialization of variables in proper+ compiler print_all/1.

Newly introduced variables weren't serialized correctly in print_all/1.
Merge branch 'master' into esf

Conflicts:
	bats/proper-plus.pl
Proper+ compiler generates better is_<sort>().
Merge branch 'master' into esf

Conflicts:
	tests/bat-esb.h
	tests/bat-esl.h
Started kitchen BAT.

Is Poss(pickup_o1) proper+?