Add Fl_Grid based dialog demo program

This is a new test program for Fl_Grid based layout and a proof of
concept for a future dialog class based on Fl_Grid.

test/.gitignore

@@ -54,6 +54,7 @@ glpuzzle
 glut_test
 grid_alignment
 grid_buttons
+grid_dialog
 grid_login
 handle_events
 hello

test/CMakeLists.txt

@@ -110,6 +110,7 @@ CREATE_EXAMPLE (forms forms.cxx "fltk_forms;fltk")
 CREATE_EXAMPLE (fullscreen fullscreen.cxx "${GLDEMO_LIBS}")
 CREATE_EXAMPLE (grid_alignment grid_alignment.cxx fltk)
 CREATE_EXAMPLE (grid_buttons grid_buttons.cxx fltk)
+CREATE_EXAMPLE (grid_dialog grid_dialog.cxx fltk)
 CREATE_EXAMPLE (grid_login grid_login.cxx fltk)
 CREATE_EXAMPLE (handle_events handle_events.cxx "${GLDEMO_LIBS}")
 CREATE_EXAMPLE (hello hello.cxx fltk)

test/Makefile

@@ -78,6 +78,7 @@ CPPFILES =\
 	glut_test.cxx \
 	grid_alignment \
 	grid_buttons \
+	grid_dialog \
 	grid_login \
 	hello.cxx \
 	help_dialog.cxx \
@@ -168,6 +169,7 @@ ALL =	\
 	forms$(EXEEXT) \
 	grid_alignment$(EXEEXT) \
 	grid_buttons$(EXEEXT) \
+	grid_dialog$(EXEEXT) \
 	grid_login$(EXEEXT) \
 	hello$(EXEEXT) \
 	help_dialog$(EXEEXT) \
@@ -452,6 +454,8 @@ grid_alignment$(EXEEXT): grid_alignment.o
 
 grid_buttons$(EXEEXT): grid_buttons.o
 
+grid_dialog$(EXEEXT): grid_dialog.o
+
 grid_login$(EXEEXT): grid_login.o
 
 hello$(EXEEXT): hello.o