- fixed blocks that are fully used not being detected (and not freed) in memmgr_final (unfill_prev is NULL for unused blocks and full blocks)
- fixed memmgr_final giving the wrong address to _mfree (for small blocks)
- added the pointer address to most error messages (and log)
- made it append to the log file instead of rewriting it
- implemented a function to verify if a memory location is active
- other minor changes
git-svn-id: https://svn.code.sf.net/p/rathena/svn/trunk@12200 54d463be-8e91-2dee-dedb-b68131a5f0ec
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