Remove $Id$ tags, update URL's, and more

- remove obsolete svn '$Id$' tags from all source files
- update .fl files and generated files accordingly
- replace 'http://www.fltk.org' URL's with 'https://...'
- replace bug report URL 'str.php' with 'bugs.php'
- remove trailing whitespace
- fix other whitespace errors flagged by Git
- add and/or fix missing or wrong standard headers
- convert tabs to spaces in all source files

The only relevant code changes are in the fluid/ folder where
some .fl files and other source files were used to generate
the '$Id' headers and footers.

1 files changed, 2 insertions, 10 deletions

diff --git a/test/checkers_pieces.fl b/test/checkers_pieces.fl
index 2d8aef590..11e90f505 100644
--- a/test/checkers_pieces.fl
+++ b/test/checkers_pieces.fl
@@ -3,8 +3,6 @@ version 1.0400
 header_name {.h}
 code_name {.cxx}
 comment {//
-// "$Id$"
-//
 // Checkers images for the Fast Light Tool Kit (FLTK).
 //
 // Copyright 1998-2020 by Bill Spitzak and others.
@@ -15,9 +13,9 @@ comment {//
 //
 //     https://www.fltk.org/COPYING.php
 //
-// Please report all bugs and problems on the following page:
+// Please see the following page on how to report bugs and issues:
 //
-//     https://www.fltk.org/str.php
+//     https://www.fltk.org/bugs.php
 //
 } {in_source in_header
 }
@@ -33,9 +31,3 @@ data pixmaps_black_checker_king_png {selected public local filename {pixmaps/bla
 
 data pixmaps_white_checker_king_png {public local filename {pixmaps/white_checker_king.png}
 }
-
-comment {
-//
-// End of "$Id$".
-//} {in_source in_header
-}