[Pidgin] #5694: Gadu-Gadu buddy-list import should convert encoding in proper order and validate UIN

[Pidgin]

#5694: Gadu-Gadu buddy-list import should convert encoding in proper order and
validate UIN
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Reporter:  ono    |       Owner:  bartosz                
    Type:  patch  |      Status:  new                    
Priority:  minor  |   Component:  Gadu-Gadu              
 Version:  2.4.1  |    Keywords:  import server buddylist
 Pending:  0      |  
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 This patch applies following fixes:

 1. Validates that `UIN` is valid integer > 0, as only integers > 0 are
 valid user identifiers in ''Gadu-Gadu'', and any other lead to incorrect
 behavior

 2. Does `UTF8` <-> `CP1250` conversion as the beginning of import parsing
 & end of export dump so all 'glib' functions are working with UTF8
 strings, previously it was working with `CP1250` encoded strings when
 parsing import, so it may lead to incorrect behavior on non-ASCII
 characters, when they were close to field separator ''';'''

 3. Simplifies export dump

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Ticket URL: <http://developer.pidgin.im/ticket/5694>
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