ROOT wants to control what gets added to the history and what doesn't, e.g....

ROOT wants to control what gets added to the history and what doesn't, e.g. for TAuthenticate and the command line being converted to startup input (_file0 = ...).
Add ability to define history entries outside textinput; resurrect Gl_histadd().


git-svn-id: http://root.cern.ch/svn/root/trunk@39531 27541ba8-7e3a-0410-8455-c3a389f83636