config/VirtualBox_VMs/vegbiendev/README.TXT: added instructions to retrieve the contents of the VM, with the VirtualBox changes added

config/VirtualBox_VMs/vegbiendev/README.TXT: to retrieve the original contents of the backup from the VM: added steps to restore the correct VM snapshot

config/VirtualBox_VMs/vegbiendev/README.TXT: also generate list of all the files whose permissions were changed since the backup, but which are extracted with their changed permissions instead of their original ones in the backup

config/VirtualBox_VMs/vegbiendev/README.TXT: added instructions to retrieve the original contents of the backup from the VM

fix: /README.TXT: to back up vegbiendev: also back up /home/aaronmk/bien/ (instead of just symlinking to the local copy), since this can be done space-efficiently with hardlinks. this ensures that the vegbiendev backup will not be modified when the local copy of bien/ is.

lib/csvs.py: JsonReader: factored out row-dict-to-list into new row_dict_to_list_reader so that JSON-specific preprocessing is kept separate from the row format translation

lib/csvs.py: added MultiFilter, which enables applying multiple filters by nesting

lib/tnrs.py: single_tnrs_request(): JSON mode: implemented output of JSON data

lib/tnrs.py: single_tnrs_request(): factored out wrapping in TnrsOutputStream, since this is done for both modes

fix: lib/tnrs.py: JSON mode: TSV export columns: need to translate these to JSON column names before they can be used with the JSON data