ob-core.el: Fix numeric error and add header-args
* lisp/ob-core.el (org-babel-view-src-block-info): when a property
value was numeric, an error was raised. Fixed by converting property
value to string before evauation.
* lisp/ob-core.el (org-babel-view-src-block-info): Add property string
"header args" to output of org-babel-view-src-block-info to make
debugging of header-args setting problems easier.
* lisp/ob-core.el (org-babel-view-src-block-info): Add property string
for language specific "header args:LANG" to output of org-babel-view-src-block-info to make
debugging of header-args setting problems easier.