Remove hardcoded version numbers (part 2) and more documentation

The goal is to change the version number for a new release only in
CMakeLists.txt. This is the second step.

This commit also adds a chapter "Migrating Code from FLTK 1.4 to 1.5".

Details:

- documentation/CMakeLists.txt: configure 'version.dox'
- fluid/documentation/CMakeLists.txt: same as above
- documentation/Doxyfile.in: add "Migrating Code from FLTK 1.4 to 1.5"
- documentation/src/index.dox: include 'version.dox' and 'migrating...'
- fluid/documentation/src/index.dox: same as above
- documentation/src/preface.dox: include 'version.dox'
- documentation/version.dox.in: input to CMake configure 'version.dox'
- fluid/documentation/version.dox.in: same as above
- documentation/src/migration_1_4.dox: update links
- documentation/src/migration_1_5.dox: new documentation chapter

1 files changed, 7 insertions, 0 deletions

diff --git a/fluid/documentation/CMakeLists.txt b/fluid/documentation/CMakeLists.txt
index c729aecd9..3bbdcd755 100644
--- a/fluid/documentation/CMakeLists.txt
+++ b/fluid/documentation/CMakeLists.txt
@@ -47,6 +47,13 @@ if(FLTK_BUILD_FLUID_DOCS OR FLTK_BUILD_PDF_DOCS)
     string(REGEX REPLACE " .*$" "" DOXYGEN_VERSION_SHORT ${DOXYGEN_VERSION})
   endif(DOXYGEN_FOUND)
 
+  # configure version.dox (includes the bare FLTK version number)
+  configure_file(
+    ${CMAKE_CURRENT_SOURCE_DIR}/version.dox.in
+    ${CMAKE_CURRENT_BINARY_DIR}/version.dox
+    @ONLY
+  )
+
   # configure copyright.dox (includes current year)
   configure_file(
     ${CMAKE_CURRENT_SOURCE_DIR}/copyright.dox.in