Changes from 1.20.99.5 to 1.20.99.6

- enable netrc support to be compatible with libfetch variable

- enable by default all supported kind of authentication for curl

- Fix duplicated rquery

- Make missing plugins non fatal (needed for smooth packagekit support)

- Do not complain about Last-Modified head if the fetch was a failure

- Support for jobs cancellation (needed for packagekit support)

- update sqlite3 to 3.43.0

- update lua to 5.4.6

- plug plenty of memory leaks

- improve debug output in particular for sql statements

- exclude locked package early from autoremove candidates

- fix very slow orphan test computation consuming 100% of CPU in autoremove