Defined wordchar table

[afredd]

Explicitly define the array wordchar_table[].

• use unsigned char and not int - minor space saving
• smaller code footprint (no init_wordchar_table() code)

[forgottenswitch]

http://stackoverflow.com/questions/10670213/efficiency-char-array-vs-int-array mentions that char could be slower than int.

[ggreer]

Sorry, but this is harder to understand, more lines of code, and less likely to work across platforms. There's a slight performance improvement since wordchar_table[] is already initialized, but it's not worth the extra complexity and brittleness.