Drop 1.0 compatibility; document 1.4 migration

The FLTK 1.0 compatibility support by defining macro 'FLTK_1_0_COMPAT'
did no longer work since FLTK 1.3.x and nobody complained. Hence we
can safely remove this "feature".

Documentation changes:

 - Drop chapter 'Migrating Code from FLTK 1.0 to 1.1'
 - Drop chapter 'Migrating Code from FLTK 1.1 to 1.3'
 - Add  chapter 'Migrating Code from FLTK 1.3 to 1.4'

The removed chapters are still available in FLTK 1.3 docs.

1 files changed, 52 insertions, 0 deletions

diff --git a/documentation/src/migration_1_4.dox b/documentation/src/migration_1_4.dox
new file mode 100644
index 000000000..425135ca9
--- /dev/null
+++ b/documentation/src/migration_1_4.dox
@@ -0,0 +1,52 @@
+/**
+
+ \page	migration_1_4	Migrating Code from FLTK 1.3 to 1.4
+
+This appendix describes the differences between the FLTK
+1.3.x and FLTK 1.4.x functions and classes.
+
+\section migration_1_4_old_versions Migrating From FLTK 1.0 Or 1.1 To 1.4
+
+If you want to migrate your code from FLTK 1.0 or 1.1 to FLTK 1.4,
+then you should first consult the relevant appendices in FLTK 1.3
+documentation online or by downloading the FLTK 1.3 documentation.
+See https://www.fltk.org/doc-1.3/index.html
+and/or https://www.fltk.org/software.php , respectively.
+
+
+\section migration_1_4_headers Minor Changes in Header Files
+
+(to be documented)
+
+
+
+\section migration_1_4_preferences Fl_Preferences
+
+(to be documented)
+
+
+
+\htmlonly
+<hr>
+<table summary="navigation bar" width="100%" border="0">
+<tr>
+  <td width="45%" align="LEFT">
+    <a class="el" href="osissues.html">
+    [Prev]
+    Operating System Issues
+    </a>
+  </td>
+  <td width="10%" align="CENTER">
+    <a class="el" href="index.html">[Index]</a>
+  </td>
+  <td width="45%" align="RIGHT">
+    <a class="el" href="development.html">
+    Developer Information
+    [Next]
+    </a>
+  </td>
+</tr>
+</table>
+\endhtmlonly
+
+*/