[fpc-devel] Patch to sqliteds and db units

[pascalive]

Here's a patch that does the following in *sqlite*ds:

- Change the way the database handle is retrieved
- Makes CreateBlobStream handle bmWrite mode properly
- Makes changes in Get/SetFieldData to adapt to recent changes in TDataset
- Small refactorings and some debug info tweaks

BTW:
  As suggestions to the recent changes made in TDataset, please consider the following (patches in db.zip):
 - Make TField.GetData(Buffer: Pointer) and TField.SetData(Buffer: Pointer) inlined (reduces function call overhead without increasing size)
 - Changes the order of the "if" in GetData so it evaluates to true in most frequent situation

Luiz Americo
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