null byte in the middle

function for initialization is no longer necessary

This reverts commit 1aa6c288.

The wb interface adds a null byte, so we were getting two of them. Going
back to the requirement that the caller of an encoder adds a null
byte, which means that the blob.encode() method must do so as well.

the generated .man.rst document.

distribution

with it)

except when the encoding is the empty string

update that to a released varnish version later)

when the encoding and decoding are the same is only allowed when the
decoding was legal. Also, use a VRT function to concatenate the
STRING_LIST into workspace (rather than rolling our own).

which a workspace is available

in the process, simplify identity decoding