• new parser for version strings
  • handles more of the old & irregular versions correctly
  • preserves more info from the version string
    old one stripped all non-numeric text like "-dontuse", "-yakkety", etc
    new one captures all the extra bits into version_extra
  • mostly trying to get ready for supporting other kernel flavors than just "-generic"
• fix --install-latest was ignoring point updates
• fix display and cache handling in the case where you have rc kernels enabled, install an rc kernel, and then disable rc kernels, the installed rc kernel was no longer recognized as a mainline kernel and displayed as a distro kernel with the dpkg package version