Help: Document deprecated properties.

Document the COMPILE_DEFINITIONS_<Config> properties as deprecated.
Add new sections for deprecated properties and move POST_INSTALL_SCRIPT
and PRE_INSTALL_SCRIPT there as well.
Tests/CTestTestMemcheck: Tolerate malloc guard in BC output
Merge topic 'fix_guard_malloc_forbc'

80ee17d8 Tests/CTestTestMemcheck: Tolerate malloc guard in BC output
Merge topic 'deprecated-properties'

5bbec4e3 Help: Document deprecated properties.