This is only the first step towards a full Lisp implementation, and
does not remove the old C code.  On the contrary, it is partly based
on using the old C code, which is to be replaced in steps.  This also
makes it easy to test that it produces the same output as the old.

* src/doc.c (Fsubstitute_command_keys_old): Rename from
Fsubstitute_command_keys.
(Fget_quoting_style): New defun to expose text_quoting_style to Lisp.
(syms_of_doc): Expose above symbols.
* lisp/help.el (substitute-command-keys): New Lisp version of
substitute-command-keys.  (Bug#8951)

* src/keymap.c
(Fdescribe_map_tree): New defun to expose describe_map_tree to Lisp.
(syms_of_keymap): New defsubr for Fdescribe_map_tree.

* src/keyboard.c (help_echo_substitute_command_keys):
* src/doc.c (Fdocumentation, Fdocumentation_property):
* src/print.c (print_error_message):
* src/syntax.c (Finternal_describe_syntax_value): Fix calls to use new
Lisp implementation of substitute-command-keys.

* test/src/doc-tests.el: Remove file.
* test/lisp/help-tests.el: Add tests for substitute-command-keys
copied from above file.

* doc/lispref/internals.texi (Module Values): Document
make_unibyte_string (bug#34873).

* src/emacs-module.c (module_make_unibyte_string): New function.
(initialize_environment): Export it.

* src/module-env-25.h: Define it.

* test/data/emacs-module/mod-test.c (Fmod_test_return_unibyte):
Test it.

* test/src/emacs-module-tests.el (module/unibyte): Test it.

This makes it possible to run most of the redisplay code (tho not the
actual drawing since there's nowhere to draw) even when there's no
real frame at hand, as is the case in batch mode.
This makes `xdisp-tests--minibuffer-resizing` work even in batch.

(redisplay_internal): Obey it.
(init_xdisp): Set `echo_area_window` even in noninteractive mode.
* src/dispnew.c (update_frame): Skip the initial frame.
* src/frame.c (make_frame): Use 80x25 as the default initial size.

* test/src/xdisp-tests.el (xdisp-tests--minibuffer-resizing):
Use the new var and fix use of `executing-kbd-macro`.

This now tests the interface between parse-partial-sexp and the low level
comment function in syntax.c

* test/src/syntax-tests.el (syntax-comments-midpoint): New function.
(syntax-pps-comments): New macro.
(top level): Two new syntax-br-comments tests and five new syntax-pps-comments
tests.

* test/data/syntax-comments.txt (top level): Amend some test fragments and add
some more.

This now tests the interface between scan_lists and the comment functions.

* test/src/syntax-tests.el (syntax-br-comments): New macro.
({-in, ;-in, /*-in): Set parse-sexp-ignore-comments to t.
(top level): Add 15 tests for comments inside brace lists.

* test/data/syntax-comments.txt (top level): Amend some test fragments.

78eacf31e8 ; Fix many typos in symbols in docs and comments
d5d12707d6 * doc/misc/flymake.texi (Using Flymake): Fix a typo.  (Bug...

# Conflicts:
#	lisp/allout.el
#	lisp/progmodes/ebrowse.el

* test/src/syntax-tests: Add a new section testing some aspects of comment
  handling in syntax.c.  This needs further enhancement.  It uses ....

* test/data/syntax-comments.txt: A new test file.

* src/indent.c (scan_for_column): Accept 2 more arguments, and
report through them the position corresponding to PREVCOL.  All
callers changed.
(Fmove_to_column): Use the prev_col's position to test for a TAB
instead of assuming that the TAB is just before point (which is
false when there's invisible text around).  (Bug#43587)

* test/src/indent-tests.el: New file.