Rip IAM_RPMDB, ie --initdb, --rebuilddb etc modes out of rpmqv.c and librpm

Rip IAM_RPMDB, ie --initdb, --rebuilddb etc modes out of rpmqv.c and librpm
- Add popt exec aliases to rpmdb for backwards compatibility
- Change test-suite to use 'rpmdb --initdb' instead of 'rpm --initdb'
  as popt exec aliases with absolute paths dont play very well
  with the test-suite, duh...