Large improvements to opcode building, added support for undocumented instructions

* Moved SYNTAX.TXT to a RELEASE directory, this is where the binary will
go and the RELEASE folder is what will be zipped and available for
download by end-users
In-progress improvements to paging documentation

The PAGE and FLOW attributes of SECTION now allow for more control over
the packing algorithim and solve an incompleteness that was niggling me
for some time.