fix standalone rules (placing artefacts in root); tidy up standalone rules #7
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Specify -output-directory to latexmk, which fixes placing the
standalone chapter PDFs in the chapter sub-directories instead of the
root.
latexmk also correctly propagates this option to pdflatex, meaning we
don't need to redefine it.
latexmk also defaults auxdir to output-directory, so we don't need to
specify that.
The phony clean and purge rules were incorrectly specified in terms
of the source files, not the destinations (e.g. expanding to
"clean/chapter1-standalone.tex").
Avoid defining two variables STANDALONE and standalone; use
STANDALONE_SOURCES for the former and STANDALONE for the latter.
Define phone 'clean-standalone' and 'purge-standalone' rules; group
them with the phony 'standalone' rule. Depend upon these later
instead of doing addprefix calculations in the dependency list for
clean/purge.
declare all three .PHONY within this section of the Makefile so all
the standalone stuff is together; remove the subsequent declaration
in the bottom-most .PHONY.