Merge topic 'FindGTK2Debug'

32cf738 FindGTK2: Remove GTK2_SKIP_MARK_AS_ADVANCED option
a874142 FindGTK2: Update local changelog
cd2d9c7 FindGTK2: Append _INCLUDE_DIR to var name in _GTK2_FIND_INCLUDE_DIR
732324f FindGTK2: Append _LIBRARY to var name in _GTK2_FIND_LIBRARY
03bd3d1 FindGTK2: Use GTK_XXX_LIBRARY_DEBUG libraries in debug mode
Merge topic 'minor-cleanups'

b8dc7fa Genex: Disallow LINKER_LANGUAGE only when used on a static library.
c8a10ba cmTarget: Fix iface libraries and languages for static libraries.
f94bdb3 cmTarget: Remove duplicates when printing traces of tll signatures
ff3d5fa Export: Fix typo of LINK_INTERFACE_LIBRARIES.
79a7a81 Docs: Document variables for default visibility values.
6f6391b Docs: Generalize and de-duplicate VISIBILITY_PREFIX docs.
d8cb47f Docs: Trim trailing whitespace in generated doc.
f10e648 Docs: Document existing target property debugging options.
4f4d69f Qt4Macros: Simplify some variable population.
a413a40 Qt4Macros: Remove undefined varible use.
b60a29e Qt4Macros: Remove unneeded generate CONDITION.
e454cba Docs: Document file(GENERATE) CONDITION as optional.
Merge topic 'ninja_bad_cmcldeps_paths'

9275554 Ninja: Update BuildDepends test to verify cmcldeps depfiles.
6fa9d0a Ninja: Make cmcldeps depfile output more consistent with 'ninja -t msvc'
Merge topic 'DocumentGraphvisOptions'

692ecf4 graphvizoptions: add copyright notice
ee32673 Add documentation for the --graphviz support
Merge topic 'rpath-on-mac'

84698ab OS X: If necessary, use xcrun to help find otool used to query install names.
Merge topic 'FindPNG-dbg-rel'

2a79753 FindPNG: improve library detection (#14301)
Merge topic 'memcheck_pre_post_args'

c0756b6 Revert "CTest: fix pre and post test commands with spaces" (#13887)
Merge branch 'master' into next
Merge topic 'PrintHelperFunctions'

e32ff96 add macros cmake_print_properties() and cmake_print_variables()
Merge topic 'fix-export-includes-crash'

f868e47 Fix crash on export of target with empty INTERFACE_INCLUDE_DIRECTORIES.
Merge branch 'master' into next