3.0.0

• Core algorithm reworked and simplified, which brings many small improvements
  • Numbers of arbitrary lengths are now compared correctly
  • Versions are now split more uniformly, so now 1.0alpha1 == 1.0.alpha1 == 1.0alpha.1 == 1.0.alpha.1
  • Any number of alphabetic/numeric compoments are now allowed (1a2b3c4 is no longer effectively trimmed to 1a2)
• Implement VERSIONFLAG_LOWER_BOUND and VERSIONFLAG_UPPER_BOUND flags
• Added version_sort and version_explain (not installed) utilities,
  useful for debugging
• Removed deprecated version_signature API