The encoding and decoding tables for Base64 are

The encoding and decoding tables for Base64 are
no longer calculated at startup.  CtdlInitBase64Table() is removed.  The tables
are now hardcoded as 'const' arrays.  Not only will this eliminate the need to do
a startup calculation, but since it is now const we will get a nice clean segv if
some other code attempts to clobber them.