Expand company mode setup a bit

Most importantly, constrain the tool tip width and allow typing
non-matching characters.

user/emacs.nix

@@ -1208,7 +1208,11 @@ in
         '';
         config = ''
           (setq company-idle-delay 0.3
-                company-show-numbers t)
+                company-show-numbers t
+                company-tooltip-maximum-width 100
+                company-tooltip-minimum-width 20
+                ; Allow me to keep typing even if company disapproves.
+                company-require-match nil)
         '';
       };