Two phase --format-names

[jorgefandinno]

Add two modes to format-names

• change the current command to not apply any changes and just print the changes to be made
• add an option --apply that also changes the database

[jorgefandinno]

@rkaminsk, I am thinking about the following refinement of the behavior we discussed:

• if no word is removed bibfmt.py format-names apply the changes and prints the modifications,
• if some word will be removed bibfmt.py format-names only prints the modifications and request to use ``bibfmt.py format-names --apply`.

Example1: The only new entry has author = {Luis Fari{\~n}as del Cerro}. Calling bibfmt.py format-names will replace this with author = {L. {Fari{\~n}as del Cerro}} and print

The following changes were applied to authors in the bibliography:
   Luis Fari{\~n}as del Cerro   ->   L. {Fari{\~n}as del Cerro}

Example2: The only new entry has author = {Luis Fari{\~n}as del Cerro and Juan Carlos Nieves}. Calling bibfmt.py format-names will not made any modifications and print

The following changes will be applied to authors in the bibliography:
   Luis Fari{\~n}as del Cerro   ->   L. {Fari{\~n}as del Cerro}

The following changes will result in the removal of some words in the first name and need to be reviewed:
   Juan Carlos Nieves  -> J. Nieves

Run "bibfmt.py format-names --apply" to apply the changes.

This only requires counting the number of words to decide which case to execute.

[rkaminsk]

As you like.