#57 Additional features for dataimport plugin

[Phillip]

Hello,

the provided patch adds a few extra features to the dataimport plugin:
1) a new checkbox allows input rows with over 100.000 characters (which fixes "java.io.IOException: Maximum column length of 100,000 exceeded in column 3 in record 519,064. Set the SafetySwitch property to false if you're expecting column lengths greater than 100,000 characters to avoid this error.").
2) a one-to-one mapping option is added to the import dialog: this maps input column number x to output column number x
3) If there is a SQL exception, then the full SQL query will be outputted to the error log before the SQLException itself.

[Phillip]

This patch adds some extra functionalitites to the dataimport plugin (correct patch this time)

[Gerd Wagner]

Is included in my local Git repo. Will be available in our central repo with my next push.