Fixed compiler warnings, including one typo in ob-lilypond



* lisp/ob-lilypond.el (ly-compile-lilyfile): Fixed misplaced comma in a

quoting expression.



* lisp/org-pcomplete.el: added missing defvar definitions for org vars



* lisp/org-src.el: added declare-function line for org-babel-tangle



* lisp/ob.el (org-scan-tags): protected the variable tags-list with a let

(other) added missing defvar declarations.