Small fixes to clear up sign-compare and implicit-declaration compile
warnings.
Free allocated memory in stats and randart code. (Thanks, valgrind.)
More freeing of allocated memory: inscription strings, monster plurals,
artifact names and descriptions overwritten by randart name generation,
store names, and textblock line lengths and starts.
Merge pull request #307 from myshkin/warnings-and-leaks

Fix warnings and leaks, thanks myshkin