Claim Free adoption

[kumy]

User story

As a GeoKret player I want to be able to adopt a GeoKret so then the GeoKret belongs to me.

Acceptance criteria

• This is an extend of GeoKrety claim adoption #84
• The GeoKret MUST have adoption flag enabled
• The GeoKret MUST have free adoption flag enabled
• The tracking code MAY be provided to validate the ownership transfer
• The free adoption flag MUST be cleared after adoption

Remarks

• Sub-issue of GeoKrety propose for adoption #82 GeoKrety propose for adoption - send email to someone #83 GeoKrety claim adoption #84 Free adoption offer #175