If you hada base Doctrine_Record class that implemented a Template and some classes
that inherited from this one using single table inheritance, the export process
failed because it tried to create several times the same table

Ticket: 423

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* added tableName option
* added deleteAll and createTable methods
* fixed fetch method
* fixed a bug with expire time in save method

'import' is a reserved word in PHP 6. Changed all method names / properties name from import to imprt. This means the documentation will need to be changed

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Added copy() method to Query.php and made NestedSet.php use it because native clone() does not work. Also Added ->getSql() to getRootAlias() so that _aliasMap is present after the parsing.