Initial implementation of NestList.
implement RegisterImport
add ExampleData1.txt example data format
begin rewriting Import
add mathics/autoload/format/Text/Import.m
Implement Conditional and Post Importers for RegisterImport
cleanup of RegisterImport
cleanup Import
implement conditionals for Import
Post importers are actually optional and occur seperately to defalt/conditional importers
cleanup Import tests
Implement Text Importer
fix bug in ReadList: graceful fail
implement StringSplit
implement CSV importer
add CSV to FileFormat
add example CSV datafile
update RegisterImport tests
make Read check if stream is open
cleanup of ReadList docs