severe name changes to nas.reader! ReadInterface is now called InputInterface. InputInterface.process_comment() has been added. InputInterface.new_session() now requires the NastranReader as its first argument.
updated test.py for new names and interface
name changes. added NastranReader.push_command(). added utils.match_signature()
fixed invaid nastran files
fixed join_arguments() which correctly formats the float value to make sure it does not contain an exponential format like 5.424e-07
added WriteSession and OutputInterface class which is a helper for writing NASTRAN files
removed some empty lines
importing nas.writer.exportcall in nas module
changed version number to v0.2.3
NastranWriter.write_comment() now does not insert a space after $ sign