Introduce reference counting for variables.
authorJohn Darrington <john@darrington.wattle.id.au>
Sat, 27 Jun 2020 15:36:48 +0000 (17:36 +0200)
committerJohn Darrington <john@darrington.wattle.id.au>
Sat, 27 Jun 2020 15:36:48 +0000 (17:36 +0200)
commitbc8bf17d5f839d6745eed040b7a28cea22b02ef5
treed9349307866910c0d47642bf37f2a58283d321af
parentac8d5f550e441001ea08b767d857f0c544aa0de0
Introduce reference counting for variables.

Necessary for upcomming commit.
src/data/dictionary.c
src/data/variable.c
src/data/variable.h
src/output/charts/scatterplot.c