v0.7.0, first version of email support, hash table cleanup

* Changed version to v0.7.0
* Now parse SMTP traffic and index to/from/subject/filenames.  Can be turned
on/off in config file with parseSMTP.  Can also be turned on/off per user inside
the user tab.
* Clean up some of the code to use a generic method to add strings to hash table.
Need to figure out how to fix the gcc warnings