Changes from pkg 1.10.99.7 to 1.10.99.8

- Add options to ignore OSVERSION check and document it

- Complain about RO filesystem for pkgdb access if needed

- Fix privileges drop done too early

- Improve OSVERSION check

- Fix some resource leaks

- Lots of documentation improvements

- Improve conflicts handling

- Do not check remote packages when doing `pkg upgrade -v`

- Convert from autotools to autosetup

- Fix warnings spotted by gcc 7+

- Fix pkg info -R to match the documented behaviour

- Update zsh completion

- Fix crash with config file handling