Implemented ticket #282 "Add time formatting functions"
Implemented ticket #272 "Improve the interface of 'sort'"
Implemented ticket #274 "Add more 'vline's and 'hline's to plots"
Implemented ticket #264 "Enable tooltips while typing into function's argument's parentheses"
Implemented ticket #276 "Add function 'findcolumn()'"
Fixed issue #281 "Comparisons between two column headlines are failing"
Fixed issue #280 "'export' doesn't work on tables"
Fixed issue #279 "Secondary axes in plots are not working if the second range is set"
Fixed issue #278 "nologscale is ignored in multiplot layout"
Fixed issue #277 "NumeRe crashes randomly while using the "med()" function"