Add a table name widget to the info page:

Other changes:
- rename method populate_fieldlist to sub populate_info;
- rename method get_columns_list to sub parse_sql_text
Fix app executable name; remove empty lines.
Add data vars.
Experiment with dynamic connection loading.
Add feature to change label for boolean columns to 'yes' or ''.
Add type to list meta data and rename load_qdf_data to load_qdf_data_init.
Use the align attr in lists; add event handler to notebook (adapted from Tpda3).
Remove extra spaces.
Start-up changes:

Implement load selected mnemonic.
Manage default and current mnemonics.
At start:
- load the default or the desired mnemonic;
- do not try to connect;
Make connection an object.
Dynamically connect/disconnect: no more Singleton for connections.

Refactor driver module loading;
Improve exception handling and user messages format;
Disable the refresh button on idle mode;
Fix status bar connection info;
Fix connection editing, it was always editing the current mnemonic.
Fix user and pass types; remove 'error#' from messages.
Fix type for connection port.
Add more info messages.
Small fixes:

Fix message when an invalid mnemonic is required to be loaded;
Fix connection status display;
Miscellaneous changes:

Add clearing method for the querylist form;
In editor controls add a newline only after some contents;
Rename some methods;
Remove empty lines;
Fix method name.
Properly load a selected mnemonic.
Change the template; remove parameters, add a patern so we can search for it.