Fix old URL's and forum/newsgroup names

- fltk.development has been renamed to fltk.coredev
- all FLTK URL's are now of the form https://www.fltk.org/…

CHANGES_1.1.txt

@@ -225,7 +225,7 @@ CHANGES IN FLTK 1.1.8                            RELEASED: Mar 27 2008
   - Making a child group visible in a Fl_Tabs or Fl_Wizard
     group now shows that tab or pane.
   - Added fl_open_uri() function as proposed on
-    fltk.development.
+    fltk.coredev.
   - Added Fl::has_check() which previously was prototyped
     and documented, but not implemented (STR #1542)
   - Enabled Fl::add_check() on OS X (STR #1534)

documentation/src/examples.dox

@@ -5,7 +5,7 @@
 The FLTK distribution contains over 60 sample applications written
 in, or ported to, FLTK. If the FLTK archive you received does not
 contain either an 'examples' or 'test' directory, you can download
-the complete FLTK distribution from \b http://fltk.org/software.php .
+the complete FLTK distribution from \b https://www.fltk.org/software.php .
 
 Most of the example programs were created while testing a group of widgets.
 They are not meant to be great achievements in clean C++ programming, but

src/Fl_Menu_add.cxx

@@ -324,7 +324,7 @@ int Fl_Menu_Item::insert(
   corresponding submenu terminators (maybe more than one) are added as well.
 
   \todo Raw integer shortcut needs examples.
-        Dependent on responses to http://fltk.org/newsgroups.php?gfltk.development+v:10086 and results of STR#2344
+        Dependent on responses to https://www.fltk.org/newsgroups.php?gfltk.coredev+v:10086 and results of STR#2344
  */
 int Fl_Menu_::add(const char *label,int shortcut,Fl_Callback *callback,void *userdata,int flags) {
   return(insert(-1,label,shortcut,callback,userdata,flags));    // -1: append

src/fl_shortcut.cxx

@@ -188,7 +188,7 @@ const char* fl_shortcut_label(unsigned int shortcut, const char **eom) {
 
   // Add modifier key names.
   // Note: if necessary we could change the order here depending on the platform.
-  // However, as discussed in fltk.development, the order appears to be the
+  // However, as discussed in fltk.coredev, the order appears to be the
   // same on all platforms, with exceptions in _some_ Linux applications.
 
   if (shortcut & FL_CTRL)  {p = add_modifier_key(p, end, fl_local_ctrl);}