[fpc-pascal] ibconnection patch

[Joao Morais]

Hello,

The following patches fixes the lack of sqlscale var when writing 
decimal and numeric fields to ib/fb databases. I've used the same 
approach used to read such fields, ie, intpower.

Patch 1 has also a small improvement regarding the read of the XSQLVAR 
record, patch 2 only fixes the sqlscale.

Both patches are against fixes_2_2. Let me know if it's still useful, 
otherwise I will checkout trunk and create another patch.

--
Joao Morais
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