merge pkg_install-20210410

- simplified version checking for netbsd, treat 9.0 and 9.1 as compatible
- minor man page updates

merge pkg_install after import of 20201202 version

Merge pkg_install-20170419.

pkg_install-20100130:
- pkg_add -U to rplace an installed version
- refactored man pages
- PKG_DBDIR / PKG_REFCOUNT_DBDIR as pkg_install.conf options
- synced license list
- use connection cache from

pkg_install-20100130:
- pkg_add -U to rplace an installed version
- refactored man pages
- PKG_DBDIR / PKG_REFCOUNT_DBDIR as pkg_install.conf options
- synced license list
- use connection cache from libfetch

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Import pkg_install-20090806:
- pkg_add: add support to check license conditions before installation
- pkg_delete: add -k option to skip over preserve packages.
- WARNS=4 clean, fix some potential use

Import pkg_install-20090806:
- pkg_add: add support to check license conditions before installation
- pkg_delete: add -k option to skip over preserve packages.
- WARNS=4 clean, fix some potential uses of uninitialized variables

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Import pkg_install-20090201. From the branch merge in pkgsrc:
- DB support is always included from libnbcompat if needed
- pkg_view and linkfarm are not installed any more; they are not moved
into th

Import pkg_install-20090201. From the branch merge in pkgsrc:
- DB support is always included from libnbcompat if needed
- pkg_view and linkfarm are not installed any more; they are not moved
into the attic yet, so they can easily be installed as separte package
- common configuration file to customise the behavior of various
components; this supersedes the old audit-packages.conf
- support for PKSC7 signatures (using X509 certs) and GPG signatures for
packages in a secure way. See pkg_admin(8) for how to create them and
pkg_install.conf(5) for the options to use them
- audit-packages and download-vulnerability-list are wrapper scripts
around pkg_admin. They try to mimic the classic options if used
sanely.
"pkg_admin audit" is now an order of magnitude faster than before
- pkg_add uses libarchive and libfetch instead of external ftp and tar:
- progress bar is currently missing for downloads
- "pkg_add -" is no longer supported
- no adhoc check for conficts between dependencies and already
installed packages
- "pkg_add -s" has been replaced with an option in pkg_install.conf,
verification of plain detached GPG signatures is no longer supported
- optional check for vulnerabilities before adding a package
- if /var and /usr/pkg are on different fileystems it is twice as fast
now
- conflicts due to overlapping plists are checked before installation
- pkg_add no longer plays with the process limits
- pkg_add and pkg_delete have a new destdir option; scripts have to
either be modified to use PKG_DESTDIR or should be disabled
- pkg_add -u for now can't be used to update to the exact same version
- internal "rm -rf" and "mkdir_p" code
- all memory allocation failures are not explicitly fatal
- if a file is not removed due to a failed checksum, still remove the
entry from pkgdb

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Import pkg_install-20080916. Major changes include:
- vulnerability check backend moved into lib for reuse in pkg_add
- add pkg_install.conf parsing for common configuration of the various
pkg_inst

Import pkg_install-20080916. Major changes include:
- vulnerability check backend moved into lib for reuse in pkg_add
- add pkg_install.conf parsing for common configuration of the various
pkg_install components
- fix crashes related to uninitialised PLIST structures
- check explicitly if the required files in pkgdb are present, fixing
issues with ~empty left-over directories
- improve hardlink handling in pkg_create using the libarchive link
resolver
- pkg_delete with -P overwrite now updates the pkgdb correctly
- silence warning about empty /var/db/pkg, it provides no value
- pkg_info uses libfetch for remote locations and works without
temporary files, speeding up operation a lot

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