Add road map to developer's documentation.

- Create KiCad road map document.
- Add road map to developer's documentation.
- A separate road map build command to CMake so the road map can be built
  separately for use in websites.
- Update .bzrignore to ignore road map files generated by Doxygen.

.bzrignore

@@ -28,6 +28,7 @@ version.h
 config.h
 install_manifest.txt
 Documentation/doxygen
+Documentation/development/doxygen
 *.bak
 common/pcb_plot_params_keywords.cpp
 include/pcb_plot_params_lexer.h

CMakeLists.txt

@@ -687,6 +687,13 @@ if( DOXYGEN_FOUND )
         DEPENDS Doxyfile
         COMMENT "building doxygen docs into directory Documentation/doxygen/html"
         )
+    add_custom_target( dev-docs
+        ${CMAKE_COMMAND} -E remove_directory Documentation/development/doxygen
+        COMMAND ${DOXYGEN_EXECUTABLE}
+        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/Documentation/development
+        DEPENDS Doxyfile
+        COMMENT "building developer's resource docs into directory Documentation/development/doxygen/html"
+        )
 else()
     message( STATUS "WARNING: Doxygen not found - doxygen-docs (Source Docs) target not created" )
 endif()

Doxyfile

@@ -338,7 +338,7 @@ TYPEDEF_HIDES_STRUCT   = NO
 # 2^(16+SYMBOL_CACHE_SIZE). The valid range is 0..9, the default is 0,
 # corresponding to a cache size of 2^16 = 65536 symbols.
 
-SYMBOL_CACHE_SIZE      = 0
+SYMBOL_CACHE_SIZE      = 4
 
 # Similar to the SYMBOL_CACHE_SIZE the size of the symbol lookup cache can be
 # set using LOOKUP_CACHE_SIZE. This cache is used to resolve symbols given
@@ -349,7 +349,7 @@ SYMBOL_CACHE_SIZE      = 0
 # formula: 2^(16+LOOKUP_CACHE_SIZE). The valid range is 0..9, the default is 0,
 # corresponding to a cache size of 2^16 = 65536 symbols.
 
-LOOKUP_CACHE_SIZE      = 0
+LOOKUP_CACHE_SIZE      = 6
 
 #---------------------------------------------------------------------------
 # Build related configuration options
@@ -661,7 +661,8 @@ WARN_LOGFILE           =
 # directories like "/usr/src/myproject". Separate the files or directories
 # with spaces.
 
-INPUT                  = kicad \
+INPUT                  = Documentation/development/road-map.md \
+                         kicad \
                          pcbnew \
                          cvpcb \
                          eeschema \