1.17 (2019/01/03)

• Rename Makefile.
• Modernise C++ #include style.
• Make some globals static.
• Initialise variables in analogue.cpp to reassure compiler.
• Remove ancient to-do list.
• Use GCC export map to ensure only ladspa_descriptor() is exported. Don't strip on install.
• Package with version number in archive and directory names.
• Tweaks to documentation processing.
• Use C99 isnormal() to identify denormals (and other bad numbers).