**
** Options:
**
**    -div       On success, adds a DIV wrapper around the
**               resulting SVG output which limits its max-width to
**               its computed maximum ideal size.
**
**    -div-indent  Like -div but indents the div.
**
**    -div-center  Like -div but centers the div.
**
**    -div-left    Like -div but floats the div left.
**
**    -div-right   Like -div but floats the div right.
**
**    -div-toggle  Sets the 'toggle' flag on the div (used by the
**                 JavaScript-side post-processor).
**
**    -div-source  Sets the 'source' flag on the div (used by the
**                 JavaScript-side post-processor).
**
**    -src       Stores the input pikchr's source code in the output as
**               a separate element adjacent to the SVG one. The
**               source element initially has the "hidden" CSS class.
**
**    -th        Process the input using TH1 before passing it to pikchr.
**
**    -th-novar  Disable $var and $<var> TH1 processing. Use this if the
**               pikchr script uses '$' for its own purposes and that
**               causes issues. This only affects parsing of '$' outside
**               of TH1 script blocks. Code in such blocks is unaffected.
**
**    -th-nosvg  When using -th, output the post-TH1'd script
**               instead of the pikchr-rendered output.
**
**    -th-trace  Trace TH1 execution (for debugging purposes).
**
**
** The -div-indent/center/left/right flags may not be combined.
**
** TH1-related Notes and Caveats:
**
** If the -th flag is used, this command must open a fossil database
** for certain functionality to work (via a checkout or the -R REPO
** flag). If opening a db fails, execution will continue but any TH1
** commands which require a db will trigger a fatal error.
**