* implement the cli option  -R reformat:path
* check if coopy_every=1 for update loop works correctly
* check if udc_ is not working.
* test lc_numeric
* in filter_ini() , allow for custom column names when checking for 
  valid column names. 
* allow "copy" to ignore certain columns (not founnd in db table)
* if pgloader.pl already has the following features, document them!
* Need detailed documentation for usage
* can the present pgloader.pl parse (unquoted) space-delimited data?
* show why commit failed                                 DONE?
* show which entries failed                              DONE
* allow for datestyle, lc_numeric, etc,.                 DONE
* should take data from STDIN                            DONE
* should have command-line to change table               DONE
* Option -e to continue if only some data                DONE
* enable pgloader to update tables based on pk           DONE
* implemet size in summary table                         DONE
