1.0.1

Version 1.0.1

This release introduces a number of new variables :—

- `FINDFILTERONLY`, `FINDFILTEROUT`, `FINDINCLUDEFILTERONLY`, and
  `FINDINCLUDEFILTEROUT` enable the use of regular expressions to
  filter which files are found by ⛩📰 书社 as sources and includes.
  By default these are “basic” regular expressions; for “extended”
  regular expressions, set the corresponding `〜EXTENDED` variable to
  some non·empty value.

- `DATAOPTS` allows for the specification of additional options for
  only the first stage when doing a two‐stage build.

All of these things are fairly advanced functionality, mainly useful in
situations where the source directories, for some reason or another,
don’t conform to ⛩📰 书社’s expectations. This is often the case when
⛩📰 书社 is being used as a transformation layer on top of an existing
data repository, rather than when building basic websites with
⛩📰 书社’s architecture in mind.