v3.0.0 - Code cleanup and refactoring

• Clarify --all switch in the man page.
• Lots of code cleanups and refactoring.
• Fix root permissions checking for the various possible actions.
• The following variables have been deprecated:
  • REMAKE_INITRD
  • MODULES_CONF
  • MODULES_CONF_OBSOLETES
  • MODULES_CONF_ALIAS_TYPE
  • MODULES_CONF_OBSOLETE_ONLY

What's Changed

• Random selection of fixes and cleanups by @evelikov in #171
• Fixup root checking for add/remove/install... by @evelikov in #172

Full Changelog: v2.8.8...v3.0.0