6.5.1 Release

Predominantly fixes several bugs found through fuzz testing:

*    FIXED: Ensure use of bash for creating AllTests.c
*    FIXED: Fix array overflow with wide tables
*    FIXED: Fix edge case error in definition lists
*    FIXED: Fix edge case in block parsing
*    FIXED: Fix edge case in fenced code blocks
*    FIXED: Fix error when pruning tokens
*    FIXED: Fix memory leak
*    FIXED: Fix metadata edge case
*    FIXED: Fix metadata parsing edge case
*    FIXED: Fix name mismatch of mmd6-default-metadata (Addresses #173)
*    FIXED: Fix null dereference
*    FIXED: Fix tests
*    FIXED: Fix typos
*    FIXED: Use more definitive edge case fix
*    UPDATED: Shorten hash function for compiling speed since we are hashing shorter strings
*    UPDATED: Update notes source text