Merge from origin/emacs-26

a1c53d4 (origin/emacs-26) * admin/admin.el (make-manuals-dist--1): Up...
d0f745f Document some compilation-mode faces
23ccba0 Mention the assignment form in "Copyright Assignment"
0f5568e Fix confusing wording in the user manual
70ec392 Fix the MSDOS build when running under CWSDPMI
7a608fc * lisp/progmodes/python.el: Be more careful about temp file r...

diff --cc admin/admin.el
Simple merge

diff --cc doc/emacs/building.texi
Simple merge

diff --cc doc/emacs/maintaining.texi
Simple merge

diff --cc lisp/progmodes/python.el
Simple merge

diff --cc src/dispnew.c
Simple merge

diff --cc src/frame.c
Simple merge

diff --cc src/msdos.c
Simple merge