Added check for sassc as alternative to sass

Merge branch 'master' of https://github.com/Otago-InfoSci-Database/Handbook

Removed check for PHP Numbers/Words module ...

Pending removal from the calendar modules (ref #13).

Partially refactored standard LaTeX options

Added hack for LaTeX VS Code extension

Added -synctex=1 to default LaTeX options

Added java.awt.headless to PlantUML invocation ...

Setting this to true suppresses the Dock icon when running PlantUML
from the shell on macOS.

Changed all PlantUML rules to use -pipe ...

This seems to work more consistently with include files.
It also removes the need to rename LaTeX output files.

Updated README to match last update.

Automated calculation of current year and first Monday. ...

This means we no longer have to change the dates every year! Note that this does imply that the scripts now always generate output for the current year, so you can’t run them ahead of time (e.g., in December).

Whoops, missed the local configuration input file.

Added jar to configuration.

Added javac to configuration.

• Changed from lecture-specific macros to generic macros that can generate any lecture date (closes #8).

• Added check for Perl executable so that AX_PROG_PERL_VERSION works properly. ...

• Tweaked PHP output.

• Added PHP checks (closes #9).

• Made order of tests consistent with order of output.

• Updated to AX versions of various macros from the Autoconf archive. ...

• Added macros to check for existence of Perl modules.
• Removed unused macros.

• Fixed typo in comment.

• Moved commonly-used LaTeX flags into central infrastructure.

• Set up global, self-deleting temporary directory to use in situations where tools can’t be pipelined together (closes #5). ...

• Added mktemp command to configuration to support the above.

Merge branch 'master' of https://github.com/Otago-InfoSci-Database/Handbook

• Updated documentation of LaTeX calendar date generation.

• Added some missing variables to the debug target.

• Fixed wonky variable in debug target.

• Reverted SVG to PDF conversions back to Inkscape, as it seems to do a better job of fonts than rsvg-convert, and the eariler performance issues appears to have been fixed.

• Redesigned how lecture file base names are constructed, to make it easier to include lecture numbers in the output file names. ...

• Added support for new DOC_NUM (replaces CHAPTER) and DOC_TYPE variables.
• Added missing defaults for various LaTeX options.
• Added support for new LATEX_FLAGS variable.

• Corrected --jobname to -jobname for LaTeX commands (although it worked anyway).

• Added a pdfcrop to the end of PlantUML → SVG pipeline, as different converters don’t always crop the output.

• Added PlantUML suffixes to standard list.