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Data Export/Import Heapspace And String Literal Issues

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https://github.com/liquibase/liquibase/compare/master...carljoans:mysqlspecific
1.) Trying to export data from a very big table crashes liquibase, because it pulls all the data from the table at once.
      -- issue resolved for mysql in block 226 at the link above, mysql dump only
      -- pulls 10000 records at a time and dumps into separate csv files.
2.) Trying to import data from a very big csv file crashes liquibase.
      -- resolution to issue 1 solves this as well.
3.) String literals in Oracle. If the value in an insert statement [ "insert into table ( column )values( 'very long value' )" ] exceeds 4000 characters Oracle generates an error. Breaking the value string up into Oracle variables solves it unless your variable value exceeds 30000 characters, then a secondary string literal error is generated. So then you need to break that variable into smaller pieces as well.
      -- resolved at block 133 for Oracle only.

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