[Kexi] Patch - FieldList Crash

[Sharan Rao]

Hi,

 Attached is a patch for kexidb/fieldlist.cpp. Earlier, if 
FieldList::autoIncrementFields()  ( which, doxygen tells me, is not called by 
anyone else till now ), was responsible for a crash in the future when the 
FieldList object was being destroyed . 

There was an attempt to delete the autoincrement fields two times. The first 
time is when the members of  m_autoinc_fields are deleted, and the second 
time is when members of FieldList::m_fields are deleted.

Any suggestions ?

Cheers!
 Sharan Rao

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