build for distribution of 2.1.4

wrap nucsyn_remove_mass_from_surface with #ifdef NUCSYN...#endif so we can build without NUCSYN defined

add binary_c_install_legacy to docs

more updates to meson: new option binary_c_install_legacy to install binary_c and libbinary_c in the src tree (the legacy location)

also working on docker

sync latest perl mods
meson now detects the version dynamically
update meson sourcefile searcher scripts
fix PCH dependencies in meson build

backwards compatibility

All other functions should not have been exposed in the shared library but were: now fixed by mixing the visibility flag into CFLAGS.

slight changes to the API, updated the perl mods

see CHANGES