I hate bold text while coding. Is it possible to disable bold text (and underline) in every single file and emacs's interface?
The easiest way is probably
(set-face-bold-p 'bold nil)
Another possibility, which also deals with underlines, would be to evaluate the following snippet in a running Emacs session:
(mapc
(lambda (face)
(set-face-attribute face nil :weight 'normal :underline nil))
(face-list))