* lisp/progmodes/bat-mode.el (bat-font-lock-keywords): Match
word and symbol constituents when looking for variable names
to fontify; also, correct the syntax table and mark the equal
sign (=) character as punctuation. Improve fontification
accuracy of iteration/positional variables.
(bat-mode): Set comment-start-skip. (Bug#25541)
* test/lisp/progmodes/bat-mode-tests.el: New file, tests for
bat-mode.el.