dblatex: add missing dependencies

imagemagick, transfig, inkscape, fontconfig and ghostscript was missing.

And pass --use-python-path at install time so that script shebangs end
up with #!/path/to/python instead of #!/path/to/env python.
lilypond: add missing ghostscript path to wrapper
fop: new package

fop is a XML formatter driven by XSL Formatting Objects (XSL-FO).

Homepage: http://xmlgraphics.apache.org/fop/
asciidoc: add/update meta attributes
asciidoc: add missing dependencies

The current asciidoc expression is impure; it relies on several tools to
be found in PATH at runtime. This commit adds a enableStandardFeatures
parameter that pulls in all dependencies and patches asciidoc to contain
full paths to the tools.

enableStandardFeatures defaults to true because asciidoc may attempt to
call all tools in its default configuration. With all standard features,
the closure size increases from 255 MiB to 1.5 GiB. Set
enableStandardFeatures = false if you want a minimal asciidoc.
Merge pull request #1025 from bjornfor/asciidoc-all-deps

asciidoc: add missing dependencies