Add Table::timestamp_pos (useful to output a table with timestamp feature)
Remove ostreamTable taking OTable and ITable (unnecessarily complicated)
Add timestamp feature support in ostreamTableHeader
Remove Table::add_features_from_file, extremly slow and not that useful
Implement ostream timestamp feature Table
Fix ostreamTable to support timestamp feature
Add test units for ostreamTable with timestamp features
Fix Table::update_pos (used to update target and timestamp pos while filtering)
Add UTest for filtering with target and timestamp features
Remove now useless (in practive at least) force feature user option
Add option for timestamp feature in eval-table
Fix force features implementation
Minor whitespace clean up
Fix force feature in feature selection
Remove old comment and use nullptr instead of NULL
Add user options to output candidates with labels
Improve help message about outputting combo programs with labels
Merge pull request #1044 from ngeiswei/expand-eval-candidate

Expand eval candidate
Remove force features because forcing unloaded features is not supported anymore
Rename ignore-enfore-target-dataset.csv to timestamp-dataset.csv