Fixed bug (`assoc-val' is now `an-assoc-val').
Added `an-build-filters-hash' and `an-build-havings-hash'.
Added `an-build-dimensions-list'.
Removed an unused function.
Added `an-build-time-intervals-list'.
Fixed bug in `an-build-dimensions-list'. We define as ``Dimensions'' all of those `columns' that are not also in `havings'.
Added utility functions `an-get-*-type' and `an-*p' for metrics and dimensions.
Got `an-really-print-report-meta' working. Added several functions along the way.