fix for buffer limit in loading string

Handle write and read errors.

This makes it simpler to handle errors in code importing this package.

Implement r opcode LONG_BINPUT

Fix struct encoding

There was accidentally an extra empty dict.  Also, reduce the scope of a
local variable.

Changed the filenames ogórek.go and ogórek_test.go to use the precomposed Latin Small Letter O With Acute.

Changed the filenames for `ogórek.go` and `ogórek_test.go` use the precomposed Latin Small Letter O With Acute.

printf verb fix

Global and reduce implementation

Implement the TUPLE2 Opcode

d.marker() doesn't seem to be the proper way to get stack length, use #'len on d.stack for #'loadTuple2 instead

out of the top two items on the stack.'

Implement binunicode and long1

Remove binary.{Read,Write} in favour of doing it by hand

Improve test coverage