Removes individuals from interim dataset; fixes #1052

Removes data for individuals in the interim dataset who did not consent to have data shared
Notes recent script changes in the changelog
Updates VERSION file to 0.6.0.pre
Changes two datetime variables to type numeric; fixes #1054
Updates display names to clarify 'days from index date'; fixes #1053
Bumps Spout to version 0.10.1
Version bump to v0.6.0.beta1
Further clarifies date display names
cc: @mrueschman re: #1053
Recodes ages higher than 89 to 90; closes #1055
Notes age censorship in the changelog
Version bump to v0.6.0.rc
Version 0.6.0 finalized