Changes in version 2021-11-03 changes due to z-Tree 5... (different xls format, table names contain linebreaks...) Changes in version 2019-02-04 plyr no longer imported (to avoid conflict with dplyr) Changes in version 2018-12-30 more compact warnings for manipulated files, if getOption(zTree.encoding) is NULL, then getOption(encoding) is used. Changes in version 2017-01-05 load options correctly Changes in version 2016-12-19 CRAN requirements CRAN requirements Changes in version 2016-12-18 documentation Changes in version 2016-12-17 added tables=NULL to read all tables in zTreeTables Changes in version 2016-09-01 example to read .sbj-files was misleading Changes in version 2016-03-30 robust against missing entries in .sbj-files (thanks to Michaela Fitzová for the hint) added "zTree.encoding" option Changes in version 2015-04-16 handles non-z-Tree files more gracefully Changes in version 2014-10-26 added remark regarding locale (thanks to Igor Asanov for the hint). Changes in version 2013-05-14 added "zTree.silent" option Changes in version 2013-05-10 made code robust against non-existent tables, caught (predictable) warnings Changes in version 2012-12-19 corrected merging of sbj files Changes in version 2012-11-23 made merging of tables faster (at the cost of needing the plyr library) Changes in version 2012-03-19 fixed encoding to Latin1 (this becomes an issue once chats are saved in tables) Changes in version 2011-03-21 fixed problem where the first table was ignored in zTreeSbj (thanks to David Hugh-Jones for the hint) Changes in version 2009-07-11 mainly bug-fixes (during 2009 IMPRS Uncertainty Summerschool in Jena) Changes in version 2008-07-27 First public version released on the occasion of IMPRS Uncertainty Summerschool in Jena.