Improve name matching for short names

[deragent]

Currently the name matching does not care about where the name to match occurs (thus not taking into account name "boundaries").

This leads to very unsatisfying results when trying to match very short names, such as for example "Li".

To illustrate this, all the following names would be matched by "Li":

• Olivio
• Polli
• Julian
• Bellido
• etc.

This needs to be improved.

[deragent]

A few possible ideas, how to improve this:

• Match all names "exactly" taking word boundaries into account.
  • Only "Li" matches "Li"
• Apply this exact match for short names only
  • This is not ideal, as not transparent.
• Allow the user to specify in the config file, when an exact match is wanted.
  • This might be preferred and does not change the existing behavior (by default).

[deragent]

As part of this, the sanitizing of keywords and text could also be switched to https://github.com/avian2/unidecode.
But this might introduce problems related to the recently implemented #5

[deragent]

This is now implemented in 725d35a.

The prefix character for enabling exact matching is '^'.

Will close this for now.