LaTeX template: improve treatment of CSL entry-spacing.

Previously with the default template settings (`indent` variable
not set), we would get interparagraph spaces separating bib
entries even with `entry-spacing="0"`.  On the other hand,
setting `entry-spacing="2"` gave ridiculously large spacing.
This change makes the spacing caused by `entry-spacing` a multiple
of `\parskip` by default, which gives aesthetically reasonable
output.  Those who want a larger or smaller unit (e.g. because
they use `indent` which sets `\parskip` to 0) may
`\setlength{\cslentryspacingunit}{10pt}` in header-includes
to override the defaults.

Closes #7296.

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