fcl-db/dbase: 
+ support for stream-backed memo file which satisfies TTestSpecificTDBF.TestMemoClose test
* fix default record size 64 for (V)FP memo files

git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@24395 3ad0048d-3df7-0310-abae-a5850022a9f2