Merge branch 'jn/editor-pager'

* jn/editor-pager: Provide a build time default-pager setting Provide a build time default-editor setting am -i, git-svn: use "git var GIT_PAGER" add -i, send-email, svn, p4, etc: use "git var GIT_EDITOR" Teach git var about GIT_PAGER Teach git var about GIT_EDITOR Suppress warnings from "git var -l" Do not use VISUAL editor on dumb terminals Handle more shell metacharacters in editor names