added 'py' command
added list simulations command
1. added pyshell command. 2. split up <command> <arguments> into <command> <option> <parameters>
added list data fields option
added ability to show user data
show memory usage
brief in-file description of simulation 01, 02
brief in-file description of simulation 03, 04, 05
added "flush" command
Merge pull request #12 from mauriceling/master

1. brief description for examples 01 to 05. 2. py, pyshell commands in DOSE shell