Astrodbkit v0.6

A significant update on how the database is loaded and used in astrodbkit:

astrodb.Database() now takes either a .db or .sql file (assumes .db if the filename does not end in either). If an .sql file, the database is generating from ascii tables stored in the specified directory (default: tabledata/). This changes the workflow to allow version-controlling the individual ascii tables rather than the binary .db file. A variety of new methods exist to utilize this new workflow.

• there is a new save() method to output the .sql file along with all the data in the database to the specified directory
• there is a modified close() method that closes the connection and asks to save the database and delete the .db file

In addition, this release includes the following changes and bug fixes:

• query() method now has a fmt='pandas' option to return the results in pandas DataFrame format
• the new info() method displays basic information on the loaded database (ie, the tables present and the number of entries in each)
• the new snapshot() method produces a snapshot of the database, useful for extracting published versions of the database
• a new help() method provides a brief summary of how to use astrodb.Database
• SQL TEXT fields are treated as numpy.dtype objects rather than strings to avoid truncation