dev
plugins: move plugin search dir one level up
implement history id command
sync with stable-3.6 which has all changes from dev, but in different order, to prevent future conflicts
Harden TDNF build by enforcing various GCC build flags
add --urls option similar to --downloadonly, to just print the URLs to packages
remove out dated author info from source files
replace PTDNF_CMD_OPT with llconf nodes
Add repoquery downgrades support