[Pxlib-devel] SQL timestamps should be quoted, part 2

[Michael S. <MSt...@gm...>]

This patch fixes a similar problem as the one found by Kenneth Porter last year. This time in the sqlite part.

I've checked it for pxfDate. 

pxfTime seems to have a similar bug, so I corrected it as well, but I don't have a Paradox database at hand using this data field type.