2019-03-14 v0.2-2

* Prevent truncation of long tables when importing large files
* Fix a memory leak possibly resulting from misuse of tree.hh library
* Decode strings using Riconv interface instead of Rcpp::Function
  call, making it much faster

2019-03-01 v0.2-1

* Added support for multi-spreadsheets, matrices and notes
* Correctly decode byte strings read from the file
* Fix undefined variable access found by UBSan

2019-02-06 v0.1-1

* Function read.opj imports individual spreadsheets as data.frames
