Changes since v0.6.0
1. Renamed CHANGES to changes.txt; added src/version.h
2. Updated aclocal.m4; added support for CPPFLAGS (based upon patch
   from Rafael Laboissière)
3. Removed top-level Makefile (Rafael Laboissière)

Changes since 0.5.0
1. Fixed uninitialized variable (John E. Davis)
Changes since 0.4.0
1. Some code cleanup (John. E. Davis)
2. Added object-oriented interface (John E. Davis)
3. Added support for prepared statements
4. Removed underscores from exception class names
5. Added some support for unsigned integers and long long integers
