build: Add se:built-with property to metadata to note the version of …

…the tools used to build the ebook

Catch keyboard interrupts in long-running scripts

create-draft: Adapt to new PG link scheme

Add flag to *really* install data files

Add MANIFEST.in for easier tracking of data files

Bundle fonts with the toolset

Bump version number

Bump version number

Bump version number

Fix indent level bug and rearrange some early checks in build