Add method to get underlying sqlite3 pointer

[rogerbinns]

From rogerbinns on September 14, 2008 20:17:37

See thread http://itsystementwicklung.de/pipermail/list-pysqlite/2008-September/000149.html

Original issue: http://code.google.com/p/apsw/issues/detail?id=26

[rogerbinns]

From rogerbinns on October 06, 2008 00:00:06

There are actually two parts to this. One is to provide the connection created by
apsw to another library. This is trivial implemented in r260 .

The second is to create an apsw connection supplied by another library. That is
significantly harder since there are cleanup issues - who owns the pointer, who
notifies whom when the connection needs to be closed. I'll leave this part alone
until someone has a use case and decisions to address the underlying issues.

Status: Verified